{"id":101762,"date":"2023-12-06T13:52:27","date_gmt":"2023-12-06T12:52:27","guid":{"rendered":"https:\/\/aquainfo.nl\/?p=101762"},"modified":"2025-09-26T13:18:58","modified_gmt":"2025-09-26T11:18:58","slug":"8-review-of-aquarium-filters","status":"publish","type":"post","link":"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/","title":{"rendered":"8. Review of Aquarium Filters"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87_1 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#One_Big_Scam\" >One Big Scam<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#Replacing_the_Filter_Media_is_a_Big_SCAM\" >Replacing the Filter Media&nbsp;is a Big SCAM!!!&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#Review_Of_Aquarium_Filters\" >Review Of Aquarium Filters<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#81_Review_of_Types_of_Filters_in_Depth\" >8.1. Review of Types of Filters in Depth<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#General_Comments_on_Types_of_Filters\" >General Comments on Types of Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#Test_of_Filters\" >Test of Filters<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#Filter_Ammonia_Oxidation_Test_Results\" >Filter Ammonia Oxidation Test Results<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#811_Filter_Test\" >8.1.1. Filter Test<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#Discussion_of_Results\" >Discussion of Results<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#Myths_About_Aquarium_Filters\" >Myths About Aquarium Filters<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#81_Review_of_Types_of_Filters\" >8.1. Review of Types of Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#82_Hang-on-back_Filters\" >8.2. Hang-on-back Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#83_Canister_Filters\" >8.3. Canister Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#831_Canisters_in_Depth\" >8.3.1. Canisters in Depth<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#832_Do-it-yourself_Canisters\" >8.3.2. Do-it-yourself Canisters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#833_FX_Series_Canister_Filters\" >8.3.3. FX Series Canister Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#84_Sponge_Filter\" >8.4. Sponge Filter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#85_Under-gravel_Filters\" >8.5. Under-gravel Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#86_Sumps\" >8.6. Sumps<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#861_Sumps_in_Depth\" >8.6.1. Sumps in Depth<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#862_Static_Submerged_Media_Sumps\" >8.6.2. Static Submerged Media Sumps<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#863_Trickle_Filters\" >8.6.3. Trickle Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#864_Wet-dry_Sumps\" >8.6.4. Wet-dry Sumps<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#865_Fluidized_Bed_Sumps\" >8.6.5 Fluidized Bed Sumps<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#866_Do-it-yourself_Sump\" >8.6.6. Do-it-yourself Sump<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#867_Foam_Sump\" >8.6.7. Foam Sump<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#87_Other_Types_of_Filters\" >8.7. Other Types of Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#871_Sand_Filters\" >8.7.1. Sand Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#872_%E2%80%9CHigh_Performance%E2%80%9D_Filters\" >8.7.2. \u201cHigh Performance\u201d Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#873_Hamburg_Matten_Filters\" >8.7.3. Hamburg Matten Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#874_Diatomaceous_Earth_Filters\" >8.7.4. Diatomaceous Earth Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#875_DIY_Bottle_Filters\" >8.7.5. DIY Bottle Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#876_Small_Filters\" >8.7.6. Small Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#877_Bottom_of_Tank_Matten\" >8.7.7. Bottom of Tank Matten<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#878_Small_DIY_Filters\" >8.7.8. Small DIY Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#88_Sizing_Filters_and_Media\" >8.8. Sizing Filters and Media<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#89_Anaerobic_Reactors\" >8.9. Anaerobic Reactors<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/#891_Biocenosis_Reactor\" >8.9.1. Biocenosis Reactor<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"One_Big_Scam\"><\/span>One Big Scam<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Any discussion of&nbsp;<strong>ANY<\/strong>&nbsp;filter requires a disclaimer.&nbsp;<strong>ALL<\/strong>&nbsp;commercial filters almost without exception tell the owner to replace the filter media (Cartridges, sponge, ceramic rings, carbon, Matrix, etc.) on a regular basis, once a month, once every three month or once every six months. Supposedly this is because the media becomes clogged and dirty. And the media is ridiculously expensive. We must emphasis:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote has-vivid-red-color has-text-color has-link-color wp-elements-1 is-layout-flow wp-block-quote-is-layout-flow\">\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Replacing_the_Filter_Media_is_a_Big_SCAM\"><\/span><strong>Replacing the Filter Media&nbsp;is a Big SCAM!!!&nbsp;<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Yes, there is absolutely no reason to replace the media on a regular basis other than to make a lot of money for the supplier of the filter.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"763\" height=\"512\" src=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Crayfish-neon-red-Procambarus-clarkii.jpg\" alt=\"Crayfish neon red Procambarus clarkii\" class=\"wp-image-101765\" srcset=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Crayfish-neon-red-Procambarus-clarkii.jpg 763w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Crayfish-neon-red-Procambarus-clarkii-300x201.jpg 300w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Crayfish-neon-red-Procambarus-clarkii-150x101.jpg 150w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Crayfish-neon-red-Procambarus-clarkii-600x403.jpg 600w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Crayfish-neon-red-Procambarus-clarkii-441x296.jpg 441w\" sizes=\"(max-width: 763px) 100vw, 763px\" \/><figcaption class=\"wp-element-caption\">Crayfish neon red Procambarus clarkii<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Review_Of_Aquarium_Filters\"><\/span>Review Of Aquarium Filters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Every aquarium needs a filter to do the biofiltration. These filters have many different aspects which need to be considered.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Filter<\/th><th># of 3&#8243;<br>Fish<br>Crystal<br>Clear*<\/th><th>Media<br>Capacity<br>cubic<br>inches<\/th><th>Cost<\/th><th>Looks<\/th><th>Leak<br>potential<\/th><\/tr><\/thead><tbody><tr><td>Cartridge internal<\/td><td>0<\/td><td>4-10<\/td><td>$<\/td><td>Decent<\/td><td>None<\/td><\/tr><tr><td>Cartridge<br>Hang-on-Back<\/td><td>0<\/td><td>6-15<\/td><td>$<\/td><td>Great<\/td><td>Common<\/td><\/tr><tr><td>Airlift Sponge<\/td><td>2-8<\/td><td>6-200<\/td><td>$<\/td><td>Bad<\/td><td>None<\/td><\/tr><tr><td>Sponge with sump<\/td><td>3-10<\/td><td>60-200<\/td><td>$<\/td><td>Bad<\/td><td>None<\/td><\/tr><tr><td>Matten Corner<\/td><td>5-8<\/td><td>100-160<\/td><td>$<\/td><td>Bad<\/td><td>None<\/td><\/tr><tr><td>Bottom-to-top flow<br>Hang-on-Back<\/td><td>10-20<\/td><td>180-260<\/td><td>$$<\/td><td>Great<\/td><td>Common<\/td><\/tr><tr><td>Under-gravel<br>with airlifts<\/td><td>15-30<\/td><td>1,000-2,000<\/td><td>$<\/td><td>Good<\/td><td>None<\/td><\/tr><tr><td>Under-gravel<br>with pumps<\/td><td>20-40<\/td><td>1,000-2,000<\/td><td>$<\/td><td>Good<\/td><td>None<\/td><\/tr><tr><td>Canister<\/td><td>25-50<\/td><td>500-1,000<\/td><td>$$$<\/td><td>Great<\/td><td>Common<\/td><\/tr><tr><td>Static Sump<\/td><td>100-300<\/td><td>2,000-6,000<\/td><td>$$$$**<\/td><td>Great<\/td><td>Some<\/td><\/tr><tr><td>Fluidized Sump<\/td><td>200-600<\/td><td>2,000-6,000<\/td><td>$$$$**<\/td><td>Great<\/td><td>Some<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">*Assumes a good filter media (foam, plastic pot scrubbers, or K1)<br>** A DIY sump can be made quite cheaply<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">*# of 3\u2033 Fish refers to the number of three-inch fish that can be given crystal clear water with this filter. Ammonia oxidation is much easier than crystal clear water so for ammonia oxidation multiply the numbers by ten to twenty. Note this chart is a very very gross approximation. Also, this review assumes a typical 29 to 40-gallon tank with correspondingly sized filters. And it assumes that an overflow siphon is not visually objectionable while a dirty sponge sitting in a tank is objectionable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is a very simplistic analysis that won\u2019t satisfy the dedicated hobbyist.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To go into filters in a much deeper review go to the following link:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"81_Review_of_Types_of_Filters_in_Depth\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-1-review-of-aquarium-filters-in-depth\/\" data-type=\"post\" data-id=\"101787\">8.1. Review of Types of Filters in Depth<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"532\" src=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-koningsi-Mbenji-1024x532.jpg\" alt=\"Auloncara koningsi Mbenji\" class=\"wp-image-101767\" srcset=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-koningsi-Mbenji-1024x532.jpg 1024w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-koningsi-Mbenji-300x156.jpg 300w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-koningsi-Mbenji-150x78.jpg 150w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-koningsi-Mbenji-600x312.jpg 600w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-koningsi-Mbenji-768x399.jpg 768w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-koningsi-Mbenji-990x514.jpg 990w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-koningsi-Mbenji-441x229.jpg 441w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-koningsi-Mbenji.jpg 1074w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Auloncara koningsi Mbenji<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"General_Comments_on_Types_of_Filters\"><\/span>General Comments on Types of Filters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The larger the fish and the more fish the more cubic inches of media are needed. All these filters have their pluses and their minuses. Which one you use is a matter of personal preference and wallet size.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Personally, I love under-gravel filters and have always had them on&nbsp;<strong>ALL<\/strong>&nbsp;my tanks. I find hang-on-backs to be very poor performers compared to under-gravels and I haven\u2019t owned a hang-on-back in many years. And sponge filters are great for breeding tanks but kind of ugly in decorative tanks. Large tanks (&gt;75 gallons) with lots of fish and\/or large fish do best with sumps.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many hundred million dollars of research in recirculating aquaculture systems (RAS) has clearly established that two or three-chamber K1 Fluidized Bed Sumps are two to four times better on a cubic inch per cubic inch basis of filter media than any other filtration system.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"490\" src=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Petrotilapia-genalutea-Luwala-1024x490.jpg\" alt=\"Petrotilapia genalutea Luwala\" class=\"wp-image-101769\" srcset=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Petrotilapia-genalutea-Luwala-1024x490.jpg 1024w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Petrotilapia-genalutea-Luwala-300x144.jpg 300w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Petrotilapia-genalutea-Luwala-150x72.jpg 150w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Petrotilapia-genalutea-Luwala-600x287.jpg 600w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Petrotilapia-genalutea-Luwala-768x368.jpg 768w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Petrotilapia-genalutea-Luwala-990x474.jpg 990w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Petrotilapia-genalutea-Luwala-441x211.jpg 441w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Petrotilapia-genalutea-Luwala.jpg 1191w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Petrotilapia genalutea Luwala<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Hang-on-back filters are sometimes the only option for folks, especially for small tanks. Cartridge hang-on back filters (or cartridge in-tank filters) are very poor for biofiltration. They will oxidize ammonia but they won\u2019t give crystal clear water. They are especially bad if one replaces the cartridges once a month like the directions say (this is simply one big scam to make money!).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For hang-on-back filter optimization Corey\u2019s (Aquarium Co-op) has an excellent video. It\u2019s a great video from a guy who knows his stuff. He recommends replacing the media, cartridges and baskets with foam blocks and adding foam pre-filters to the inlet tube. This will decidedly improve any hang-on-back filter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If a filter rapidly plugs up with brown gunk in a week or two weeks the filter is simply too small to do an adequate job of filtration. While low biofiltration (i.e. filter size) is the major factor other factors can contribute to it:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Heavy stocking<\/li>\n\n\n\n<li>Heavy feeding<\/li>\n\n\n\n<li>Low protein food<\/li>\n\n\n\n<li>Low aeration<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"801\" height=\"529\" src=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Neocaridina-davidi-Blue-Shrimp.jpg\" alt=\"Neocaridina davidi Blue Shrimp\" class=\"wp-image-101771\" srcset=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Neocaridina-davidi-Blue-Shrimp.jpg 801w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Neocaridina-davidi-Blue-Shrimp-300x198.jpg 300w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Neocaridina-davidi-Blue-Shrimp-150x99.jpg 150w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Neocaridina-davidi-Blue-Shrimp-600x396.jpg 600w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Neocaridina-davidi-Blue-Shrimp-768x507.jpg 768w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Neocaridina-davidi-Blue-Shrimp-441x291.jpg 441w\" sizes=\"(max-width: 801px) 100vw, 801px\" \/><figcaption class=\"wp-element-caption\">Neocaridina davidi Blue Shrimp<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Test_of_Filters\"><\/span>Test of Filters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A test of the ammonia-oxidizing capability of various filters was tested with the media recommended for use with them, except that any mechanical filtration such as Polyfil or 40 ppi foam was not used. The various filters and their ammonia oxidizing capabilities tracked very closely to their filter media surface area. Cartridge filters and hang-on-back filters did not do well, canisters and under-gravel filters did moderately well, and the sumps did great.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"962\" height=\"572\" src=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-stuargranti-Galeriya-reef.jpg\" alt=\"Auloncara stuargranti Galeriya reef\" class=\"wp-image-101773\" srcset=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-stuargranti-Galeriya-reef.jpg 962w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-stuargranti-Galeriya-reef-300x178.jpg 300w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-stuargranti-Galeriya-reef-150x89.jpg 150w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-stuargranti-Galeriya-reef-600x357.jpg 600w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-stuargranti-Galeriya-reef-768x457.jpg 768w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Auloncara-stuargranti-Galeriya-reef-441x262.jpg 441w\" sizes=\"(max-width: 962px) 100vw, 962px\" \/><figcaption class=\"wp-element-caption\">Auloncara stuargranti Galeriya reef<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Filter_Ammonia_Oxidation_Test_Results\"><\/span><strong>Filter Ammonia Oxidation Test Results<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ammonia was added to aquariums with various filters. The resulting ammonia levels were measured three days later, and the amount of ammonia added adjusted according to the measured ammonia level. These are the results:<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th><\/th><th class=\"has-text-align-left\" data-align=\"left\">Milliliters<br>Solution<\/th><th class=\"has-text-align-left\" data-align=\"left\">Dilute <br>Oxidized<\/th><th class=\"has-text-align-left\" data-align=\"left\">Ammonia<br> <\/th><th>          <br><\/th><\/tr><\/thead><tbody><tr><td><strong>Filter<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>Average<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\">30<br>days<\/td><td class=\"has-text-align-left\" data-align=\"left\">60<br>days<\/td><td>90<br>days<\/td><\/tr><tr><td>1 inch of gravel<\/td><td class=\"has-text-align-left\" data-align=\"left\">0.5<\/td><td class=\"has-text-align-left\" data-align=\"left\">.5<\/td><td class=\"has-text-align-left\" data-align=\"left\">.25<\/td><td>.5<\/td><\/tr><tr><td>Cartridge HOB<\/td><td class=\"has-text-align-left\" data-align=\"left\">3.8<\/td><td class=\"has-text-align-left\" data-align=\"left\">4<\/td><td class=\"has-text-align-left\" data-align=\"left\">4<\/td><td>4<\/td><\/tr><tr><td>Sponge Filter<\/td><td class=\"has-text-align-left\" data-align=\"left\">8<\/td><td class=\"has-text-align-left\" data-align=\"left\">4<\/td><td class=\"has-text-align-left\" data-align=\"left\">16<\/td><td>8<\/td><\/tr><tr><td>Bottom Flow HOB<\/td><td class=\"has-text-align-left\" data-align=\"left\">18<\/td><td class=\"has-text-align-left\" data-align=\"left\">8<\/td><td class=\"has-text-align-left\" data-align=\"left\">16<\/td><td>16<\/td><\/tr><tr><td>Canister<\/td><td class=\"has-text-align-left\" data-align=\"left\">32<\/td><td class=\"has-text-align-left\" data-align=\"left\">8<\/td><td class=\"has-text-align-left\" data-align=\"left\">32<\/td><td>64<\/td><\/tr><tr><td>Undergravel<\/td><td class=\"has-text-align-left\" data-align=\"left\">33<\/td><td class=\"has-text-align-left\" data-align=\"left\">8<\/td><td class=\"has-text-align-left\" data-align=\"left\">64<\/td><td>64<\/td><\/tr><tr><td>Static Sump<\/td><td class=\"has-text-align-left\" data-align=\"left\">81<\/td><td class=\"has-text-align-left\" data-align=\"left\">32<\/td><td class=\"has-text-align-left\" data-align=\"left\">128<\/td><td>128<\/td><\/tr><tr><td>Fluidized bed sump<\/td><td class=\"has-text-align-left\" data-align=\"left\">131<\/td><td class=\"has-text-align-left\" data-align=\"left\">64<\/td><td class=\"has-text-align-left\" data-align=\"left\">64<\/td><td>256<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The \u201caverage\u201d number represents the number of three inch fish each filter can give crystal clear water with. The number of three inch fish that can have their ammonia oxidized is about twenty&nbsp; times this number. Ammonia oxidation is much easier to obtain than crystal clear water.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Note that the \u201cOne Inch of Gravel\u201d in this test fairly well puts to rest the idea that the substrate in an aquarium acts as an ammonia oxidizer. This idea is a myth, per this test. Note that 0.5 is the ammonia that a few three inch fish would put out, so it is possible to have&nbsp; an aquarium with no filter in it and no ammonia. It\u2019s just that the stocking must be very light. A gravel substrate is a very weak biofilter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This test can be reviewed at this link:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"811_Filter_Test\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-1-1-aquarium-filter-test\/\" data-type=\"post\" data-id=\"101839\">8.1.1. Filter Test<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"785\" height=\"370\" src=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Aulonocara-baenschi-benga.jpg\" alt=\"Aulonocara baenschi benga\" class=\"wp-image-101776\" srcset=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Aulonocara-baenschi-benga.jpg 785w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Aulonocara-baenschi-benga-300x141.jpg 300w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Aulonocara-baenschi-benga-150x71.jpg 150w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Aulonocara-baenschi-benga-600x283.jpg 600w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Aulonocara-baenschi-benga-768x362.jpg 768w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Aulonocara-baenschi-benga-441x208.jpg 441w\" sizes=\"(max-width: 785px) 100vw, 785px\" \/><figcaption class=\"wp-element-caption\">Aulonocara baenschi benga<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Discussion_of_Results\"><\/span><strong>Discussion of Results<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This test is easily performed by anyone who wishes to duplicate it. The average numbers would appear to be representative of the number of four-inch fish this filter can give crystal clear water with (after 90 days with no cleaning). To get the number of four-inch fish for which these filters will remove the ammonia one needs to multiply the average number of fish by twenty. Ammonia oxidation is twenty times easier than obtaining crystal clear water.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Myths_About_Aquarium_Filters\"><\/span>Myths About Aquarium Filters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">There are many myths parroted around social media about filters. These myths include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The brown \u201cgunk\u201d inside the filter bio-media or filter foam is trapped feces and it is beneficial to the aquarium to remove it frequently and thoroughly.&nbsp;This is the single most damaging myth in the Hobby.<\/strong><\/li>\n\n\n\n<li>Hang-on-back filters which use cartridges, such as Marineland Penguin<sup>tm<\/sup>, Aqueon Quietflow<sup>tm<\/sup>, Tetra Whisper<sup>tm<\/sup>&nbsp;and Fluval Aqua-Clear<sup>tm<\/sup>, should have the cartridges replaced every month to three months.<\/li>\n\n\n\n<li>Filters should be cleaned at least every month.<\/li>\n\n\n\n<li><\/li>\n\n\n\n<li>Filters and sponges must be cleaned in aquarium water and never in chlorinated water.<\/li>\n\n\n\n<li>Under-gravel filters don\u2019t work well.<\/li>\n\n\n\n<li>Hang-on-back filters are filters which give great biological filtration.<\/li>\n\n\n\n<li>Most canister filters filled with the media that comes with them (typically ceramic rings and bio-balls) are great biological filters.<\/li>\n\n\n\n<li>As long as the filtration is adequate to oxidize ammonia, more filtration will not help the health of the fish.<\/li>\n\n\n\n<li>The larger the filter the less nitrates in an aquarium and the fewer water changes required.<\/li>\n\n\n\n<li>There are bad types of filters called \u201cnitrate factories\u201d.<\/li>\n\n\n\n<li>Under-gravel filters need lots of maintenance.<\/li>\n\n\n\n<li>Only the flow rate in gallons per hour determines filter efficiency, not square feet of bio-media surface.<\/li>\n\n\n\n<li>A canister which has an actual flow rate of 600 GPH (gallons per hour) can filter roughly twice the amount of fish that a canister that has an actual flow rate of 300 GPH.<\/li>\n\n\n\n<li>\u201cK1\u201d fluidized beds take longer to cycle than standard submerged beds.<\/li>\n\n\n\n<li>\u201cK1\u201d fluidized beds are not efficient as submerged static media beds.<\/li>\n\n\n\n<li>Trickle filters are very efficient filters.<\/li>\n\n\n\n<li>Wet\/dry filters are very good efficient filters.<\/li>\n\n\n\n<li>There are anaerobic nitrate removing reactor designs commercially available which work well in the aquarium.<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote has-vivid-red-color has-text-color has-link-color has-large-font-size wp-elements-2 is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>All these myths are simply false!<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">The following sections try to explain the different choices one can make in far more depth:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"81_Review_of_Types_of_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-1-review-of-aquarium-filters-in-depth\/\" data-type=\"post\" data-id=\"101787\">8.1. Review of Types of Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"82_Hang-on-back_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-2-hang-on-back-aquarium-filters\/\" data-type=\"post\" data-id=\"101869\">8.2. Hang-on-back Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"83_Canister_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-3-aquarium-canister-filters\/\" data-type=\"post\" data-id=\"101921\">8.3. Canister Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"831_Canisters_in_Depth\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-3-1-aquarium-canister-filters-in-depth\/\" data-type=\"post\" data-id=\"102088\">8.3.1. Canisters in Depth<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"832_Do-it-yourself_Canisters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-3-2-do-it-yourself-canister-filters\/\" data-type=\"post\" data-id=\"102131\">8.3.2. Do-it-yourself Canisters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"833_FX_Series_Canister_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-3-3-fx-series-canister-filters\/\" data-type=\"post\" data-id=\"102200\">8.3.3. FX Series Canister Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"84_Sponge_Filter\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-4-aquarium-sponge-filters\/\" data-type=\"post\" data-id=\"102962\">8.4. Sponge Filter<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"85_Under-gravel_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-5-under-gravel-filters\/\" data-type=\"post\" data-id=\"103080\">8.5. Under-gravel Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"86_Sumps\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-6-sump-aquarium-filters\/\" data-type=\"post\" data-id=\"103221\">8.6. Sumps<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"861_Sumps_in_Depth\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-6-1-sump-aquarium-filters-in-depth\/\" data-type=\"post\" data-id=\"103249\">8.6.1. Sumps in Depth<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"862_Static_Submerged_Media_Sumps\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-6-2-designing-an-aquarium-static-sump-filter\/\" data-type=\"post\" data-id=\"103290\">8.6.2. Static Submerged Media Sumps<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"863_Trickle_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-6-3-trickle-aquarium-filters\/\" data-type=\"post\" data-id=\"103314\">8.6.3. Trickle Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"864_Wet-dry_Sumps\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-6-4-wet-dry-aquarium-filters\/\" data-type=\"post\" data-id=\"103331\">8.6.4. Wet-dry Sumps<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"865_Fluidized_Bed_Sumps\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-6-5-fluidized-bed-sump-filters-for-aquariums\/\" data-type=\"post\" data-id=\"103342\">8.6.5 Fluidized Bed Sumps<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"866_Do-it-yourself_Sump\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-6-6-do-it-yourself-sump-filters-for-aquariums\/\" data-type=\"post\" data-id=\"103387\">8.6.6. Do-it-yourself Sump<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"867_Foam_Sump\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-6-7-foam-sump\/\" data-type=\"post\" data-id=\"103406\">8.6.7. Foam Sump<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"87_Other_Types_of_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-7-other-filters\/\" data-type=\"post\" data-id=\"95540\">8.7. Other Types of Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"871_Sand_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-7-1-sand-filters\/\" data-type=\"post\" data-id=\"103456\">8.7.1. Sand Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"872_%E2%80%9CHigh_Performance%E2%80%9D_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-7-2-high-performance-filters-for-aquariums\/\" data-type=\"post\" data-id=\"103467\">8.7.2. \u201cHigh Performance\u201d Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"873_Hamburg_Matten_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-7-3-hamburg-matten-aquarium-filter\/\" data-type=\"post\" data-id=\"103475\">8.7.3. Hamburg Matten Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"874_Diatomaceous_Earth_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-7-4-aquarium-diatomaceous-earth-filters\/\" data-type=\"post\" data-id=\"103490\">8.7.4. Diatomaceous Earth Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"875_DIY_Bottle_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-7-5-do-it-yourself-aquarium-bottle-filters\/\" data-type=\"post\" data-id=\"103495\">8.7.5. DIY Bottle Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"876_Small_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-7-6-small-filters-for-the-aquarium\/\" data-type=\"post\" data-id=\"103701\">8.7.6. Small Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"877_Bottom_of_Tank_Matten\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-7-7-bottom-of-the-tank-matten\/\" data-type=\"post\" data-id=\"103725\">8.7.7. Bottom of Tank Matten<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"878_Small_DIY_Filters\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-7-8-small-diy-aquarium-filters\/\" data-type=\"post\" data-id=\"103734\">8.7.8. Small DIY Filters<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"88_Sizing_Filters_and_Media\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-8-filter-and-media-design-for-aquariums\/\" data-type=\"post\" data-id=\"103809\">8.8. Sizing Filters and Media<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"89_Anaerobic_Reactors\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-9-anaerobic-or-anoxic-reactors-as-an-aquarium-filter\/\" data-type=\"post\" data-id=\"103879\">8.9. Anaerobic Reactors<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"891_Biocenosis_Reactor\"><\/span><a href=\"https:\/\/aquainfo.nl\/en\/8-9-1-biocenosis-reactor\/\" data-type=\"post\" data-id=\"103960\">8.9.1. Biocenosis Reactor<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"687\" height=\"496\" src=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Cyphotilapia-frontosa-Black-Widow-Line-Bred.jpg\" alt=\"Cyphotilapia frontosa Black Widow Line Bred\" class=\"wp-image-101778\" srcset=\"https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Cyphotilapia-frontosa-Black-Widow-Line-Bred.jpg 687w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Cyphotilapia-frontosa-Black-Widow-Line-Bred-300x217.jpg 300w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Cyphotilapia-frontosa-Black-Widow-Line-Bred-150x108.jpg 150w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Cyphotilapia-frontosa-Black-Widow-Line-Bred-600x433.jpg 600w, https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Cyphotilapia-frontosa-Black-Widow-Line-Bred-441x318.jpg 441w\" sizes=\"(max-width: 687px) 100vw, 687px\" \/><figcaption class=\"wp-element-caption\">Cyphotilapia frontosa Black Widow Line Bred<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-startpagina-aquariumscience\"><a href=\"\/?cat_ID=55102\" data-type=\"link\" data-id=\"https:\/\/aquainfo.nl\/en\/category\/aquariumscience-en\/\">Startpage Aquariumscience<\/a><\/h2>\n\n\n<nav style=\"color: #005d94;background-color: #f4f9fd\" class=\"has-text-color has-background has-medium-font-size is-vertical wp-block-navigation is-layout-flex wp-container-core-navigation-is-layout-8cdb3485 wp-block-navigation-is-layout-flex\" aria-label=\"AquariumScience - Engels\"><ul style=\"color: #005d94;background-color: #f4f9fd\" class=\"wp-block-navigation__container has-text-color has-background has-medium-font-size is-vertical wp-block-navigation\"><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/1-aquarium-basics\/\"><span class=\"wp-block-navigation-item__label\">1. Aquarium Basics<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"1. Aquarium Basics submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/1-2-falsehoods-and-myths\/\"><span class=\"wp-block-navigation-item__label\">1.2. Falsehoods and Myths<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/1-3-false-marketing-claims\/\"><span class=\"wp-block-navigation-item__label\">1.3. False marketing claims<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/1-4-sources-of-data\/\"><span class=\"wp-block-navigation-item__label\">1.4. Sources of data<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"1.4. Sources of data submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/1-4-1-facebook-fake-accounts\/\"><span class=\"wp-block-navigation-item__label\">1.4.1. Facebook Fake Accounts<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/1-5-aquarium-options\/\"><span class=\"wp-block-navigation-item__label\">1.5. Aquarium options<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/1-6-aquarium-fast-fish-deaths\/\"><span class=\"wp-block-navigation-item__label\">1.6. Aquarium Fast Fish Deaths<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/1-7-aquarium-slow-fish-deaths\/\"><span class=\"wp-block-navigation-item__label\">1.7. Aquarium Slow Fish Deaths<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/2-aquarium-cycling\/\"><span class=\"wp-block-navigation-item__label\">2. Aquarium Cycling<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"2. Aquarium Cycling submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-1-fish-less-cycling\/\"><span class=\"wp-block-navigation-item__label\">2.1. Fish less cycling<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-2-many-ways-to-cycle\/\"><span class=\"wp-block-navigation-item__label\">2.2. Many Ways to Cycle<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-3-how-i-cycle-an-aquarium\/\"><span class=\"wp-block-navigation-item__label\">2.3. How I Cycle an aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-4-cycling-an-aquarium-with-ammonia\/\"><span class=\"wp-block-navigation-item__label\">2.4. Cycling an Aquarium with Ammonia<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/2-5-aquarium-fish-in-cycling\/\"><span class=\"wp-block-navigation-item__label\">2.5. Aquarium Fish-in Cycling<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"2.5. Aquarium Fish-in Cycling submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-5-2-rapid-fish-in-cycling\/\"><span class=\"wp-block-navigation-item__label\">2.5.2. Rapid Fish-in Cycling<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-6-not-cycling-an-aquarium-at-all\/\"><span class=\"wp-block-navigation-item__label\">2.6. Not Cycling an Aquarium at All<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-7-new-tank-syndrome\/\"><span class=\"wp-block-navigation-item__label\">2.7. New Tank-syndrome<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/2-8-bacteria-in-a-bottle\/\"><span class=\"wp-block-navigation-item__label\">2.8. Bacteria-in-a-bottle<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"2.8. Bacteria-in-a-bottle submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-8-1-bacteria-in-a-bottle-in-depth\/\"><span class=\"wp-block-navigation-item__label\">2.8.1. Bacteria in a Bottle in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-8-2-sludge-removing-bacteria-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">2.8.2. Sludge Removing Bacteria in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-9-instant-cycling-chemicals-for-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">2.9. Instant Cycling Chemicals for the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-10-nitrogen-cycle\/\"><span class=\"wp-block-navigation-item__label\">2.10. Nitrogen Cycle<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-11-inoculate-for-cycling\/\"><span class=\"wp-block-navigation-item__label\">2.11. Inoculate for Cycling<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-12-beneficial-bacteria\/\"><span class=\"wp-block-navigation-item__label\">2.12. Beneficial Bacteria<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-13-cycling-test\/\"><span class=\"wp-block-navigation-item__label\">2.13. Cycling Test<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-14-the-mature-aquarium\/\"><span class=\"wp-block-navigation-item__label\">2.14. The Mature Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/2-15-cycling-a-planted-aquarium\/\"><span class=\"wp-block-navigation-item__label\">2.15. Cycling a Planted Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/3-fish-food\/\"><span class=\"wp-block-navigation-item__label\">3. Fish Food<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"3. Fish Food submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/3-1-insignificance-of-food\/\"><span class=\"wp-block-navigation-item__label\">3.1. Insignificance of Food<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/3-2-fish-diet-specializations\/\"><span class=\"wp-block-navigation-item__label\">3.2. Fish Diet Specializations<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/3-3-amount-of-fish-food\/\"><span class=\"wp-block-navigation-item__label\">3.3. Amount of Fish Food<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/3-4-gel-fish-food\/\"><span class=\"wp-block-navigation-item__label\">3.4. Gel Fish Food<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/3-5-breaking-up-fish-food-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">3.5. Breaking Up Fish Food in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/3-6-dry-fish-food\/\"><span class=\"wp-block-navigation-item__label\">3.6. Dry Fish Food<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/3-7-banned-fish-food\/\"><span class=\"wp-block-navigation-item__label\">3.7. Banned Fish Food<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/3-8-fish-food-and-malawi-bloat\/\"><span class=\"wp-block-navigation-item__label\">3.8. Fish Food and Malawi Bloat<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/3-9-fish-food-and-gunk\/\"><span class=\"wp-block-navigation-item__label\">3.9. Fish Food and Gunk<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/4-temperature-ph-kh-and-gh\/\"><span class=\"wp-block-navigation-item__label\">4. Temperature, pH, KH and GH<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"4. Temperature, pH, KH and GH submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-1-importance-of-water-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">4.1. Importance of Water in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-2-aquarium-temperatures\/\"><span class=\"wp-block-navigation-item__label\">4.2. Aquarium temperatures<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-3-free-floating-bacteria-in-aquariums\/\"><span class=\"wp-block-navigation-item__label\">4.3. Free Floating Bacteria in Aquariums<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/4-4-aquarium-ph\/\"><span class=\"wp-block-navigation-item__label\">4.4. Aquarium pH<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"4.4. Aquarium pH submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-4-1-aquarium-ph-is-not-important\/\"><span class=\"wp-block-navigation-item__label\">4.4.1. Aquarium pH is Not Important<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-4-2-buffering-aquarium-water\/\"><span class=\"wp-block-navigation-item__label\">4.4.2. Buffering Aquarium Water<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-4-3-carbon-dioxide-and-ph-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">4.4.3. \u00a0Carbon Dioxide and pH in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-4-4-dropping-ph-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">4.4.4. Dropping pH in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-4-5-raising-ph-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">4.4.5. Raising pH in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/4-5-water-hardness-gh-and-kh-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">4.5. Water Hardness, GH and KH in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"4.5. Water Hardness, GH and KH in the Aquarium submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-5-1-general-hardness\/\"><span class=\"wp-block-navigation-item__label\">4.5.1. General Hardness<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/4-5-2-carbonate-hardness-kh-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">4.5.2. Carbonate Hardness, KH in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"4.5.2. Carbonate Hardness, KH in the Aquarium submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-5-2-1-kh-and-cycling-in-an-aquarium\/\"><span class=\"wp-block-navigation-item__label\">4.5.2.1. KH and Cycling in an Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/4-6-salts-in-the-water-of-an-aquarium\/\"><span class=\"wp-block-navigation-item__label\">4.6. Salts in the Water of an Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"4.6. Salts in the Water of an Aquarium submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-6-1-trace-additives-for-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">4.6.1. Trace Additives for the aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-7-fish-tolerance-to-ph\/\"><span class=\"wp-block-navigation-item__label\">4.7. Fish Tolerance to pH<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/4-8-stability-isnt-important\/\"><span class=\"wp-block-navigation-item__label\">4.8. \u201cStability\u201d isn\u2019t Important<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"4.8. \u201cStability\u201d isn\u2019t Important submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-8-1-rapid-thermal-and-ph-shifts-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">4.8.1. Rapid Thermal and pH Shifts in the aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-9-un-bagging-fish-for-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">4.9. Un-bagging Fish for the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-10-orp-or-redox-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">4.10. ORP or Redox in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/4-11-tank-syndromes\/\"><span class=\"wp-block-navigation-item__label\">4.11. Tank Syndromes<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/5-ammonia-nitrite-nitrate-and-chlorine\/\"><span class=\"wp-block-navigation-item__label\">5. Ammonia, Nitrite, Nitrate and Chlorine<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"5. Ammonia, Nitrite, Nitrate and Chlorine submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/5-2-safe-ammonia-levels\/\"><span class=\"wp-block-navigation-item__label\">5.2. Safe Ammonia Levels<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"5.2. Safe Ammonia Levels submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/5-2-1-ammonia-in-the-aquarium-in-depth\/\"><span class=\"wp-block-navigation-item__label\">5.2.1. Ammonia in the Aquarium in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/5-2-3-high-ammonia-spikes-in-an-aquarium\/\"><span class=\"wp-block-navigation-item__label\">5.2.3. High Ammonia Spikes in an Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/5-3-safe-nitrite-levels\/\"><span class=\"wp-block-navigation-item__label\">5.3. Safe Nitrite Levels<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"5.3. Safe Nitrite Levels submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/5-3-2-safe-nitrite-levels-in-the-aquarium-in-more-depth\/\"><span class=\"wp-block-navigation-item__label\">5.3.2. Safe Nitrite Levels in the Aquarium in More Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/5-4-safe-nitrate-levels\/\"><span class=\"wp-block-navigation-item__label\">5.4. Safe Nitrate Levels<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"5.4. Safe Nitrate Levels submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/5-4-1-nitrate-in-depth\/\"><span class=\"wp-block-navigation-item__label\">5.4.1. Nitrate in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/5-5-chlorine-and-chloramine\/\"><span class=\"wp-block-navigation-item__label\">5.5. Chlorine and Chloramine<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"5.5. Chlorine and Chloramine submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/5-5-1-chlorination-in-the-aquarium-in-depth\/\"><span class=\"wp-block-navigation-item__label\">5.5.1. Chlorination in the Aquarium in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/5-5-2-chloramines-in-aquarium-water\/\"><span class=\"wp-block-navigation-item__label\">5.5.2. Chloramines in Aquarium Water<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"5.5.2. Chloramines in Aquarium Water submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/5-5-2-1-ammonia-in-chloramine-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">5.5.2.1. Ammonia in Chloramine in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/5-5-3-aquarium-water-conditioners\/\"><span class=\"wp-block-navigation-item__label\">5.5.3. Aquarium Water Conditioners<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"5.5.3. Aquarium Water Conditioners submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/5-5-3-1-ammonia-detoxifying-chemicals-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">5.5.3.1. Ammonia Detoxifying Chemicals in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/5-5-3-2-seachem-prime-and-seachem-safe\/\"><span class=\"wp-block-navigation-item__label\">5.5.3.2. Seachem Prime and Seachem Safe<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/5-5-3-3-conditioner-chemistry\/\"><span class=\"wp-block-navigation-item__label\">5.5.3.3. Conditioner Chemistry<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/5-5-3-4-cost-of-conditioners\/\"><span class=\"wp-block-navigation-item__label\">5.5.3.4. Cost of Conditioners<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/5-5-3-5-conditioner-testing\/\"><span class=\"wp-block-navigation-item__label\">5.5.3.5. Conditioner Testing<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/5-5-3-6-review-of-water-conditioners-for-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">5.5.3.6. Review of Water Conditioners for the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/5-5-4-stress-coat-products\/\"><span class=\"wp-block-navigation-item__label\">5.5.4. Stress Coat Products<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/6-filtration\/\"><span class=\"wp-block-navigation-item__label\">6. Filtration<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"6. Filtration submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/6-1-mechanical-filtration\/\"><span class=\"wp-block-navigation-item__label\">6.1. Mechanical Filtration<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"6.1. Mechanical Filtration submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-1-1-cleaned-mechanical-filtration\/\"><span class=\"wp-block-navigation-item__label\">6.1.1. Cleaned Mechanical Filtration<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-1-2-uncleaned-mechanical-filtration\/\"><span class=\"wp-block-navigation-item__label\">6.1.2. Uncleaned Mechanical Filtration<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/6-2-biofiltration\/\"><span class=\"wp-block-navigation-item__label\">6.2. Biofiltration<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"6.2. Biofiltration submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-2-1-detritus-explained\/\"><span class=\"wp-block-navigation-item__label\">6.2.1. Detritus Explained<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-2-2-brown-gunk\/\"><span class=\"wp-block-navigation-item__label\">6.2.2. Brown Gunk<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-2-3-cloudy-water\/\"><span class=\"wp-block-navigation-item__label\">6.2.3. Cloudy Water<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-3-over-filtration-in-an-aquarium\/\"><span class=\"wp-block-navigation-item__label\">6.3. Over-filtration in an Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/6-4-crystal-clear-water\/\"><span class=\"wp-block-navigation-item__label\">6.4. Crystal-Clear Water<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"6.4. Crystal-Clear Water submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-4-1-crystal-clear-water-in-depth\/\"><span class=\"wp-block-navigation-item__label\">6.4.1. Crystal-Clear Water in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-4-2-polishing-filtration-in-an-aquarium-filter\/\"><span class=\"wp-block-navigation-item__label\">6.4.2. Polishing Filtration in an Aquarium Filter<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/6-5-water-flow-rate-in-aquarium-filters\/\"><span class=\"wp-block-navigation-item__label\">6.5. Water Flow Rate in Aquarium Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"6.5. Water Flow Rate in Aquarium Filters submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-5-1-function-of-flow-in-an-aquarium\/\"><span class=\"wp-block-navigation-item__label\">6.5.1. Function of Flow in an Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-5-2-substrate-as-a-filter\/\"><span class=\"wp-block-navigation-item__label\">6.5.2. Substrate as a Filter<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-6-aquaponic-filtration\/\"><span class=\"wp-block-navigation-item__label\">6.6. Aquaponic Filtration<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-7-nitrate-factory\/\"><span class=\"wp-block-navigation-item__label\">6.7. Nitrate Factory<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/6-8-thorough-cleaning-a-filter\/\"><span class=\"wp-block-navigation-item__label\">6.8. Thorough Cleaning a Filter<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"6.8. Thorough Cleaning a Filter submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-8-1-filter-cleaning-tests\/\"><span class=\"wp-block-navigation-item__label\">6.8.1. Filter Cleaning Tests<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/6-9-tap-water-rinsing\/\"><span class=\"wp-block-navigation-item__label\">6.9. Tap Water Rinsing<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/7-filter-media\/\"><span class=\"wp-block-navigation-item__label\">7. Filter Media<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"7. Filter Media submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/7-1-review-of-aquarium-filter-media\/\"><span class=\"wp-block-navigation-item__label\">7.1. Review of Aquarium Filter Media<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"7.1. Review of Aquarium Filter Media submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-1-1-cost-of-filter-media\/\"><span class=\"wp-block-navigation-item__label\">7.1.1. Cost of Filter Media<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-1-2-the-function-of-aquarium-filter-media\/\"><span class=\"wp-block-navigation-item__label\">7.1.2. The Function of Aquarium Filter Media<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/7-1-3-aquarium-filter-media-tests\/\"><span class=\"wp-block-navigation-item__label\">7.1.3. Aquarium Filter Media Tests<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"7.1.3. Aquarium Filter Media Tests submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-1-3-1-ammonia-oxidizing-test\/\"><span class=\"wp-block-navigation-item__label\">7.1.3.1. Ammonia Oxidizing Test<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-1-3-2-water-clarity-test-of-aquarium-filter-media\/\"><span class=\"wp-block-navigation-item__label\">7.1.3.2. Water Clarity Test of Aquarium Filter Media<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/7-2-individual-media-list\/\"><span class=\"wp-block-navigation-item__label\">7.2. Individual Media List<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"7.2. Individual Media List submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-1-polyester-floss\/\"><span class=\"wp-block-navigation-item__label\">7.2.1. Polyester Floss<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-2-foam-media\/\"><span class=\"wp-block-navigation-item__label\">7.2.2. Foam Media<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-3-k1-media\/\"><span class=\"wp-block-navigation-item__label\">7.2.3. K1 Media<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-4-pumice-perlite\/\"><span class=\"wp-block-navigation-item__label\">7.2.4. Pumice Perlite<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-5-aquarium-gravel\/\"><span class=\"wp-block-navigation-item__label\">7.2.5. Aquarium Gravel<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-6-pp-eva-pads-for-aquarium-filters\/\"><span class=\"wp-block-navigation-item__label\">7.2.6. PP EVA Pads for Aquarium Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-7-bio-balls-aquarium-filter-media\/\"><span class=\"wp-block-navigation-item__label\">7.2.7. Bio Balls Aquarium Filter Media<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-8-pot-scrubbers-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">7.2.8. Pot Scrubbers in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-9-lava-rock-for-aquarium-filter-media\/\"><span class=\"wp-block-navigation-item__label\">7.2.9. Lava Rock for Aquarium Filter Media<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-10-growstone\/\"><span class=\"wp-block-navigation-item__label\">7.2.10. Growstone<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-11-ceramic-media-in-aquarium-filters\/\"><span class=\"wp-block-navigation-item__label\">7.2.11. Ceramic Media in Aquarium Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-12-seachem-matrix-filter-media\/\"><span class=\"wp-block-navigation-item__label\">7.2.12. Seachem Matrix filter media<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-13-clay-balls\/\"><span class=\"wp-block-navigation-item__label\">7.2.13. Clay Balls<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-2-14-biohome-filter-media\/\"><span class=\"wp-block-navigation-item__label\">7.2.14. BioHome Filter Media<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-3-calculating-filter-media-volume-requirements\/\"><span class=\"wp-block-navigation-item__label\">7.3. Calculating Filter Media Volume Requirements<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/7-4-chemical-filtration-media-in-the-aquarium-filter\/\"><span class=\"wp-block-navigation-item__label\">7.4. Chemical Filtration Media in the Aquarium Filter<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"7.4. Chemical Filtration Media in the Aquarium Filter submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-4-2-activated-carbon-in-an-aquarium-filter\/\"><span class=\"wp-block-navigation-item__label\">7.4.2. Activated Carbon in an Aquarium Filter<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-4-3-ion-exchange-resins-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">7.4.3. Ion-Exchange Resins in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-4-4-zeolite-ammonia-removing-granules-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">7.4.4. Zeolite Ammonia Removing Granules in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-4-5-phosphate-removing-granules-for-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">7.4.5. Phosphate Removing Granules for the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-4-6-purigen-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">7.4.6. Purigen in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-4-7-poly-filter-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">7.4.7. Poly-Filter in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-5-denitrifying-media-biohome-and-denitrate-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">7.5. Denitrifying Media, Biohome and De*Nitrate in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/7-6-the-surface-area-requirements-for-aquarium-filter-media\/\"><span class=\"wp-block-navigation-item__label\">7.6. The Surface Area Requirements for Aquarium Filter Media<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/8-review-of-aquarium-filters\/\"><span class=\"wp-block-navigation-item__label\">8. Review of Aquarium Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"8. Review of Aquarium Filters submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/8-1-review-of-aquarium-filters-in-depth\/\"><span class=\"wp-block-navigation-item__label\">8.1. Review of Aquarium Filters in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"8.1. Review of Aquarium Filters in Depth submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-1-1-aquarium-filter-test\/\"><span class=\"wp-block-navigation-item__label\">8.1.1. Aquarium Filter Test<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-2-hang-on-back-aquarium-filters\/\"><span class=\"wp-block-navigation-item__label\">8.2. Hang On Back Aquarium Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/8-3-aquarium-canister-filters\/\"><span class=\"wp-block-navigation-item__label\">8.3. Aquarium Canister Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"8.3. Aquarium Canister Filters submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-3-1-aquarium-canister-filters-in-depth\/\"><span class=\"wp-block-navigation-item__label\">8.3.1. Aquarium Canister Filters in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-3-2-do-it-yourself-canister-filters\/\"><span class=\"wp-block-navigation-item__label\">8.3.2. Do-it-yourself Canister Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-3-3-fx-series-canister-filters\/\"><span class=\"wp-block-navigation-item__label\">8.3.3. FX Series Canister Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-4-aquarium-sponge-filters\/\"><span class=\"wp-block-navigation-item__label\">8.4. Aquarium Sponge Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/8-5-under-gravel-filters\/\"><span class=\"wp-block-navigation-item__label\">8.5. Under Gravel Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"8.5. Under Gravel Filters submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-5-1-under-gravel-aquarium-filters-in-depth\/\"><span class=\"wp-block-navigation-item__label\">8.5.1. Under-Gravel Aquarium Filters in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-5-2-diy-undergravel-filter\/\"><span class=\"wp-block-navigation-item__label\">8.5.2. DIY Undergravel Filter<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/8-6-sump-aquarium-filters\/\"><span class=\"wp-block-navigation-item__label\">8.6. Sump Aquarium Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"8.6. Sump Aquarium Filters submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-6-1-sump-aquarium-filters-in-depth\/\"><span class=\"wp-block-navigation-item__label\">8.6.1. Sump Aquarium Filters in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-6-2-designing-an-aquarium-static-sump-filter\/\"><span class=\"wp-block-navigation-item__label\">8.6.2. Designing an Aquarium Static Sump Filter<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-6-3-trickle-aquarium-filters\/\"><span class=\"wp-block-navigation-item__label\">8.6.3. Trickle Aquarium Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-6-4-wet-dry-aquarium-filters\/\"><span class=\"wp-block-navigation-item__label\">8.6.4. Wet-Dry Aquarium Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-6-5-fluidized-bed-sump-filters-for-aquariums\/\"><span class=\"wp-block-navigation-item__label\">8.6.5. Fluidized Bed Sump Filters for Aquariums<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-6-6-do-it-yourself-sump-filters-for-aquariums\/\"><span class=\"wp-block-navigation-item__label\">8.6.6. Do-it-yourself Sump Filters for Aquariums<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-6-7-foam-sump\/\"><span class=\"wp-block-navigation-item__label\">8.6.7. Foam Sump<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/8-7-other-filters\/\"><span class=\"wp-block-navigation-item__label\">8.7. Other Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"8.7. Other Filters submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-7-1-sand-filters\/\"><span class=\"wp-block-navigation-item__label\">8.7.1. Sand Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-7-2-high-performance-filters-for-aquariums\/\"><span class=\"wp-block-navigation-item__label\">8.7.2. \u201cHigh Performance\u201d Filters for Aquariums<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-7-3-hamburg-matten-aquarium-filter\/\"><span class=\"wp-block-navigation-item__label\">8.7.3. Hamburg Matten Aquarium Filter<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-7-4-aquarium-diatomaceous-earth-filters\/\"><span class=\"wp-block-navigation-item__label\">8.7.4. Aquarium Diatomaceous Earth Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-7-5-do-it-yourself-aquarium-bottle-filters\/\"><span class=\"wp-block-navigation-item__label\">8.7.5. Do it yourself Aquarium Bottle Filters.<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-7-6-small-filters-for-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">8.7.6. Small Filters for the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-7-7-bottom-of-the-tank-matten\/\"><span class=\"wp-block-navigation-item__label\">8.7.7. Bottom of the Tank Matten<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-7-8-small-diy-aquarium-filters\/\"><span class=\"wp-block-navigation-item__label\">8.7.8. Small DIY Aquarium Filters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-8-filter-and-media-design-for-aquariums\/\"><span class=\"wp-block-navigation-item__label\">8.8. Filter and Media Design for Aquariums<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/8-9-anaerobic-or-anoxic-reactors-as-an-aquarium-filter\/\"><span class=\"wp-block-navigation-item__label\">8.9. Anaerobic or Anoxic Reactors as an Aquarium Filter<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"8.9. Anaerobic or Anoxic Reactors as an Aquarium Filter submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-9-1-biocenosis-reactor\/\"><span class=\"wp-block-navigation-item__label\">8.9.1. Biocenosis Reactor<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-9-2-a-feasible-reactor-for-doing-anoxic-aquarium-filtration\/\"><span class=\"wp-block-navigation-item__label\">8.9.2. A Feasible Reactor for doing Anoxic Aquarium Filtration<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/8-9-3-assimilatory-denitrification\/\"><span class=\"wp-block-navigation-item__label\">8.9.3. Assimilatory Denitrification<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/9-aeration-of-an-aquarium\/\"><span class=\"wp-block-navigation-item__label\">9. Aeration of an Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"9. Aeration of an Aquarium submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/9-1-aeration-in-depth\/\"><span class=\"wp-block-navigation-item__label\">9.1. Aeration in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/9-2-turbulence-and-aeration-in-an-aquarium\/\"><span class=\"wp-block-navigation-item__label\">9.2. Turbulence and Aeration in an Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/9-3-airstone-aeration-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">9.3. Airstone Aeration in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"9.3. Airstone Aeration in the Aquarium submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/9-3-2-cleaning-aquarium-air-stones\/\"><span class=\"wp-block-navigation-item__label\">9.3.2. Cleaning Aquarium Air Stones<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/9-4-skimmers-and-spray-bars-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">9.4. Skimmers and Spray Bars in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/9-5-aquarium-aeration-and-temperature\/\"><span class=\"wp-block-navigation-item__label\">9.5. Aquarium Aeration and Temperature<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/10-diseases\/\"><span class=\"wp-block-navigation-item__label\">10. Diseases<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"10. Diseases submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-1-aquarium-diseases-in-general\/\"><span class=\"wp-block-navigation-item__label\">10.1. Aquarium Diseases in General<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/10-2-skin-protozoans\/\"><span class=\"wp-block-navigation-item__label\">10.2. Skin Protozoans<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"10.2. Skin Protozoans submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/10-2-2-ich-in-far-more-depth\/\"><span class=\"wp-block-navigation-item__label\">10.2.2. Ich in far more depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"10.2.2. Ich in far more depth submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-2-2-1-ich-in-depth\/\"><span class=\"wp-block-navigation-item__label\">10.2.2.1. Ich in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-2-2-2-ich-immunity\/\"><span class=\"wp-block-navigation-item__label\">10.2.2.2. Ich Immunity<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-2-2-3-ich-medication\/\"><span class=\"wp-block-navigation-item__label\">10.2.2.3. Ich Medication<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-2-2-4-ich-medications-in-more-depth\/\"><span class=\"wp-block-navigation-item__label\">10.2.2.4. Ich Medications in More Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-2-2-5-ineffective-ich-medications\/\"><span class=\"wp-block-navigation-item__label\">10.2.2.5. Ineffective Ich Medications<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-2-2-6-filtration-of-ich\/\"><span class=\"wp-block-navigation-item__label\">10.2.2.6. Filtration of Ich<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-2-2-7-ich-and-heat\/\"><span class=\"wp-block-navigation-item__label\">10.2.2.7. Ich and Heat<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-2-3-velvet-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">10.2.3. Velvet in Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-2-4-epistylis-on-a-fish\/\"><span class=\"wp-block-navigation-item__label\">10.2.4. Epistylis on a Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-2-5-chilodonella-and-costia\/\"><span class=\"wp-block-navigation-item__label\">10.2.5. Chilodonella and Costia<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-2-6-tetrahymena\/\"><span class=\"wp-block-navigation-item__label\">10.2.6. Tetrahymena<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-2-7-cryptobia-in-fish\/\"><span class=\"wp-block-navigation-item__label\">10.2.7. Cryptobia in Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/10-3-bacterial-infections-in-fish\/\"><span class=\"wp-block-navigation-item__label\">10.3. Bacterial Infections in Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"10.3. Bacterial Infections in Fish submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-3-1-skin-ulcers-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">10.3.1. Skin Ulcers in Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-3-2-mouth-rot-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">10.3.2. Mouth Rot in Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-3-3-duck-lips-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">10.3.3. Duck Lips in Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-3-4-fin-rot-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">10.3.4. Fin Rot in Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-3-5-saddleback-in-fish\/\"><span class=\"wp-block-navigation-item__label\">10.3.5. Saddleback in Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-3-6-red-blotches-or-septicemia-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">10.3.6. Red Blotches or Septicemia in Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-3-7-white-eyes\/\"><span class=\"wp-block-navigation-item__label\">10.3.7. White Eyes<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-3-8-popeye\/\"><span class=\"wp-block-navigation-item__label\">10.3.8. Popeye<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-3-9-red-gills\/\"><span class=\"wp-block-navigation-item__label\">10.3.9. Red Gills<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-3-10-red-mouth-in-goldfish\/\"><span class=\"wp-block-navigation-item__label\">10.3.10. Red Mouth in Goldfish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-3-11-treating-bacterial-diseases-in-fish\/\"><span class=\"wp-block-navigation-item__label\">10.3.11. Treating Bacterial Diseases in Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/10-4-fish-tuberculosis\/\"><span class=\"wp-block-navigation-item__label\">10.4. Fish Tuberculosis<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"10.4. Fish Tuberculosis submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-4-1-fish-tb-in-depth\/\"><span class=\"wp-block-navigation-item__label\">10.4.1. Fish TB in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-5-hexamita-in-fish\/\"><span class=\"wp-block-navigation-item__label\">10.5. Hexamita in fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-6-flukes\/\"><span class=\"wp-block-navigation-item__label\">10.6. Flukes<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-7-fish-saprolegnia-or-fish-fungus\/\"><span class=\"wp-block-navigation-item__label\">10.7. Fish Saprolegnia or \u201cFish Fungus\u201d<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-8-lymphocystis-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">10.8. Lymphocystis in Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-9-anchor-worms\/\"><span class=\"wp-block-navigation-item__label\">10.9. Anchor Worms<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-10-black-spots-on-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">10.10. Black Spots on Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-11-tapeworms-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">10.11. Tapeworms in Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/10-12-nematodes-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">10.12. Nematodes in Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"10.12. Nematodes in Aquarium Fish submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-12-1-camallanus-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">10.12.1. Camallanus In Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-12-2-capillaria\/\"><span class=\"wp-block-navigation-item__label\">10.12.2. Capillaria<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-13-pests-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">10.13. Pests in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-14-fish-lice-on-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">10.14. Fish Lice on Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-15-dwarf-gourami-disease\/\"><span class=\"wp-block-navigation-item__label\">10.15. Dwarf Gourami Disease<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/10-16-graphite-disease-in-bettas\/\"><span class=\"wp-block-navigation-item__label\">10.16. Graphite Disease in Bettas<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/11-fish-disease-symptoms\/\"><span class=\"wp-block-navigation-item__label\">11. Fish Disease Symptoms<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"11. Fish Disease Symptoms submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/11-1-hole-in-the-head-syndrome\/\"><span class=\"wp-block-navigation-item__label\">11.1. Hole in the Head Syndrome<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"11.1. Hole in the Head Syndrome submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-1-1-hexamita-and-hith\/\"><span class=\"wp-block-navigation-item__label\">11.1.1. Hexamita and HITH<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-1-2-spots-on-the-head-of-fish\/\"><span class=\"wp-block-navigation-item__label\">11.1.2. Spots on the Head of Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-2-white-poop-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">11.2. White Poop in Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-3-malawi-bloat\/\"><span class=\"wp-block-navigation-item__label\">11.3. Malawi Bloat<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-4-dropsy\/\"><span class=\"wp-block-navigation-item__label\">11.4. Dropsy<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-5-hollow-belly\/\"><span class=\"wp-block-navigation-item__label\">11.5. Hollow Belly<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-6-swim-bladder-syndrome-in-tropical-fish\/\"><span class=\"wp-block-navigation-item__label\">11.6. Swim Bladder Syndrome in Tropical Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-7-shimmying-in-tropical-fish\/\"><span class=\"wp-block-navigation-item__label\">11.7 Shimmying in Tropical Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-8-twirling-in-tropical-fish\/\"><span class=\"wp-block-navigation-item__label\">11.8. Twirling in Tropical Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-9-spinal-deformities-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">11.9. Spinal Deformities in Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-10-white-skin-blotches-on-a-fish\/\"><span class=\"wp-block-navigation-item__label\">11.10. White Skin Blotches on a fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-11-red-skin-blotches\/\"><span class=\"wp-block-navigation-item__label\">11.11. Red Skin Blotches<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-12-neon-disease\/\"><span class=\"wp-block-navigation-item__label\">11.12. Neon Disease<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-13-slime-coat-syndrome-on-a-fish\/\"><span class=\"wp-block-navigation-item__label\">11.13. Slime Coat Syndrome on a Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-14-scaly-skin-on-a-fish\/\"><span class=\"wp-block-navigation-item__label\">11.14. Scaly Skin on a Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-15-fish-not-eating\/\"><span class=\"wp-block-navigation-item__label\">11.15. Fish not Eating<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-16-aggression-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">11.16. Aggression in Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-17-black-death-in-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">11.17. Black Death in Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-18-black-head-syndrome\/\"><span class=\"wp-block-navigation-item__label\">11.18. Black Head Syndrome<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/11-19-gas-bubble-disease\/\"><span class=\"wp-block-navigation-item__label\">11.19. Gas Bubble Disease<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/12-treatment-of-fish-disease-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">12. Treatment of Fish Disease in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"12. Treatment of Fish Disease in the Aquarium submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-1-basics-of-treatment-of-fish-diseases\/\"><span class=\"wp-block-navigation-item__label\">12.1. Basics of Treatment of Fish Diseases<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-2-treatments-summary-for-fish-diseases\/\"><span class=\"wp-block-navigation-item__label\">12.2. Treatments Summary for Fish Diseases<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-3-quarantine-tanks\/\"><span class=\"wp-block-navigation-item__label\">12.3. Quarantine Tanks<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/12-4-ineffective-medicines-for-fish-diseases\/\"><span class=\"wp-block-navigation-item__label\">12.4. Ineffective Medicines for Fish Diseases<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"12.4. Ineffective Medicines for Fish Diseases submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-4-1-natural-aquarium-medications\/\"><span class=\"wp-block-navigation-item__label\">12.4.1. \u201cNatural\u201d Aquarium Medications<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-4-2-salt-for-treating-fish-disease\/\"><span class=\"wp-block-navigation-item__label\">12.4.2. Salt for Treating Fish Disease<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-4-3-aquarium-dyes\/\"><span class=\"wp-block-navigation-item__label\">12.4.3. Aquarium Dyes<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-4-5-antiseptics-for-treating-fish-disease\/\"><span class=\"wp-block-navigation-item__label\">12.4.5. Antiseptics for Treating Fish Disease<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-4-6-furan-and-sulfa-drugs-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">12.4.6. Furan and Sulfa Drugs in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-4-7-quinine-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">12.4.7. Quinine in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-5-fish-dont-drink\/\"><span class=\"wp-block-navigation-item__label\">12.5. Fish Don\u2019t Drink<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-6-sterilization-of-aquariums\/\"><span class=\"wp-block-navigation-item__label\">12.6. Sterilization of Aquariums<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-7-making-medicated-fish-food-for-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">12.7. Making Medicated Fish Food for the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-8-euthanizing-a-fish\/\"><span class=\"wp-block-navigation-item__label\">12.8. Euthanizing a Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-9-avoiding-diseases-in-fish\/\"><span class=\"wp-block-navigation-item__label\">12.9. Avoiding Diseases in Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/12-10-the-shotgun-approach\/\"><span class=\"wp-block-navigation-item__label\">12.10. The Shotgun Approach<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/13-stocking\/\"><span class=\"wp-block-navigation-item__label\">13. Stocking<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"13. Stocking submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/13-1-stocking-opinions\/\"><span class=\"wp-block-navigation-item__label\">13.1. Stocking Opinions<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/13-2-calculating-stocking-ratio\/\"><span class=\"wp-block-navigation-item__label\">13.2. Calculating Stocking Ratio<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/13-3-lifespan-of-an-aquarium-fish\/\"><span class=\"wp-block-navigation-item__label\">13.3. Lifespan of an Aquarium Fish<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/14-equipment-for-the-tropical-aquarium\/\"><span class=\"wp-block-navigation-item__label\">14. Equipment for the Tropical Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"14. Equipment for the Tropical Aquarium submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/14-1-uv-sterilizers-for-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">14.1. UV Sterilizers for the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"14.1. UV Sterilizers for the Aquarium submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-1-1-aquarium-uv-in-depth\/\"><span class=\"wp-block-navigation-item__label\">14.1.1. Aquarium UV in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-1-2-selecting-an-aquarium-uv-unit\/\"><span class=\"wp-block-navigation-item__label\">14.1.2 Selecting an Aquarium UV Unit<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/14-2-aquarium-substrates\/\"><span class=\"wp-block-navigation-item__label\">14.2. Aquarium Substrates<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"14.2. Aquarium Substrates submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-2-1-sand-as-an-aquarium-substrate\/\"><span class=\"wp-block-navigation-item__label\">14.2.1. Sand as an Aquarium Substrate<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-2-2-gravel-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">14.2.2. Gravel in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-2-3-buffering-substrates-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">14.2.3. Buffering Substrates in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-2-4-anaerobic-myth-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">14.2.4. Anaerobic Myth in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-3-rocks-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">14.3. Rocks in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/14-4-lights-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">14.4. Lights in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"14.4. Lights in the Aquarium submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-4-1-aquarium-light-spectrums\/\"><span class=\"wp-block-navigation-item__label\">14.4.1. Aquarium Light Spectrums<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-4-2-obsolete-lighting-standards-for-aquariums\/\"><span class=\"wp-block-navigation-item__label\">14.4.2. Obsolete Lighting Standards for Aquariums<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-5-piping-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">14.5. Piping in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-6-aquarium-pump-design\/\"><span class=\"wp-block-navigation-item__label\">14.6. Aquarium Pump Design<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-7-overflow-devices-for-aquariums\/\"><span class=\"wp-block-navigation-item__label\">14.7. Overflow Devices for Aquariums<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-8-aquarium-heaters\/\"><span class=\"wp-block-navigation-item__label\">14.8. Aquarium Heaters<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-9-wavemakers-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">14.9. Wavemakers in the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-10-wood-in-an-aquarium\/\"><span class=\"wp-block-navigation-item__label\">14.10. Wood in an Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-11-fish-electrocution\/\"><span class=\"wp-block-navigation-item__label\">14.11. Fish Electrocution<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-12-silicone-rubber-for-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">14.12. Silicone Rubber for the Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-13-aquarium-electric-cost\/\"><span class=\"wp-block-navigation-item__label\">14.13. Aquarium Electric Cost<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/14-14-cleaning-old-aquariums\/\"><span class=\"wp-block-navigation-item__label\">14.14. Cleaning Old Aquariums<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/15-planted-aquariums\/\"><span class=\"wp-block-navigation-item__label\">15. Planted Aquariums<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"15. Planted Aquariums submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-1-planted-aquariums-in-depth\/\"><span class=\"wp-block-navigation-item__label\">15.1. Planted Aquariums in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-2-fish-for-a-planted-aquarium\/\"><span class=\"wp-block-navigation-item__label\">15.2. Fish for a Planted Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-3-fish-limitations-in-a-planted-aquarium\/\"><span class=\"wp-block-navigation-item__label\">15.3. Fish Limitations in a Planted Aquarium<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-4-types-of-planted-aquariums\/\"><span class=\"wp-block-navigation-item__label\">15.4. Types of Planted Aquariums<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/15-5-aquarium-fertilizing\/\"><span class=\"wp-block-navigation-item__label\">15.5. Aquarium Fertilizing<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"15.5. Aquarium Fertilizing submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-5-1-ready-made-fertilizers\/\"><span class=\"wp-block-navigation-item__label\">15.5.1. Ready Made Fertilizers<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-5-2-fertilizer-programs\/\"><span class=\"wp-block-navigation-item__label\">15.5.2. Fertilizer Programs<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-5-3-estimative-index\/\"><span class=\"wp-block-navigation-item__label\">15.5.3. Estimative Index<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-5-4-nh4-tabs-aquarium-fertilizer\/\"><span class=\"wp-block-navigation-item__label\">15.5.4. NH4 + Tabs Aquarium Fertilizer<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-5-5-diy-epiphytic-fertilizer\/\"><span class=\"wp-block-navigation-item__label\">15.5.5. DIY Epiphytic Fertilizer<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-5-6-fish-food-fertilizer\/\"><span class=\"wp-block-navigation-item__label\">15.5.6. Fish Food Fertilizer<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-5-7-diy-fertilizers\/\"><span class=\"wp-block-navigation-item__label\">15.5.7. DIY Fertilizers<\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/15-6-carbon-dioxide-and-plants-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">15.6. Carbon Dioxide and Plants in the Aquarium<\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"15.6. Carbon Dioxide and Plants in the Aquarium submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-6-1-low-tech-co2\/\"><span class=\"wp-block-navigation-item__label\">15.6.1. Low Tech CO2<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-6-2-kh-ph-co2-relationships-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">15.6.2. KH pH CO2\u00a0Relationships in the Aquarium<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-6-3-high-tech-co2-systems\/\"><span class=\"wp-block-navigation-item__label\">15.6.3. High Tech CO2 Systems<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-6-4-co2-from-food-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">15.6.4. CO2 From Food in the Aquarium<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-6-5-aquarium-liquid-carbon-products\/\"><span class=\"wp-block-navigation-item__label\">15.6.5. Aquarium Liquid Carbon Products<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-6-6-measuring-co2\/\"><span class=\"wp-block-navigation-item__label\">15.6.6. Measuring CO2<\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-7-substrates-for-the-planted-aquarium\/\"><span class=\"wp-block-navigation-item__label\">15.7. Substrates for the Planted Aquarium<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-8-walstad-aquarium\/\"><span class=\"wp-block-navigation-item__label\">15.8. Walstad Aquarium<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-9-high-tech-planted-aquariums\/\"><span class=\"wp-block-navigation-item__label\">15.9. High Tech Planted Aquariums<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-10-hybrid-planted-aquariums\/\"><span class=\"wp-block-navigation-item__label\">15.10. Hybrid Planted Aquariums<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-11-many-fish-many-plants\/\"><span class=\"wp-block-navigation-item__label\">15.11. Many Fish Many Plants<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-12-propagating-plants\/\"><span class=\"wp-block-navigation-item__label\">15.12. Propagating Plants<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-13-hau-planted-aquariums\/\"><span class=\"wp-block-navigation-item__label\">15.13. Hau Planted Aquariums<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-14-low-tech-planted-aquariums\/\"><span class=\"wp-block-navigation-item__label\">15.14. Low Tech Planted Aquariums<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-15-sterilizing-aquarium-plants\/\"><span class=\"wp-block-navigation-item__label\">15.15. Sterilizing Aquarium Plants<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-16-natural-or-balanced-aquariums\/\"><span class=\"wp-block-navigation-item__label\">15.16. \u201cNatural\u201d or \u201cBalanced\u201d Aquariums<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/15-17-father-fish-aquariums\/\"><span class=\"wp-block-navigation-item__label\">15.17. Father Fish Aquariums<\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/16-algae-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">16. Algae in the Aquarium<\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"16. Algae in the Aquarium submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-1-aquarium-algae-biology\/\"><span class=\"wp-block-navigation-item__label\">16.1. Aquarium Algae Biology<\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/16-2-controlling-aquarium-algae\/\"><span class=\"wp-block-navigation-item__label\">16.2. Controlling Aquarium Algae<\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"16.2. Controlling Aquarium Algae submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-2-1-algae-in-fish-only-tanks\/\"><span class=\"wp-block-navigation-item__label\">16.2.1. Algae in Fish Only Tanks<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-2-2-algae-in-high-tech-tanks\/\"><span class=\"wp-block-navigation-item__label\">16.2.2. Algae in High Tech Tanks<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-2-3-algae-in-low-tech-tanks\/\"><span class=\"wp-block-navigation-item__label\">16.2.3. Algae in Low Tech Tanks<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-2-4-algae-eaters-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">16.2.4. Algae Eaters in the Aquarium<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-2-5-the-algae-war-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">16.2.5. The Algae War in the Aquarium<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-2-6-chemical-algae-control-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">16.2.6. Chemical Algae Control in the Aquarium<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-2-7-chihiros-doctor\/\"><span class=\"wp-block-navigation-item__label\">16.2.7. Chihiros Doctor<\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-3-thread-algae-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">16.3. Thread Algae in the Aquarium<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-4-blue-green-algae-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">16.4. Blue-Green Algae in the Aquarium<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-5-black-beard-algae\/\"><span class=\"wp-block-navigation-item__label\">16.5. Black Beard Algae<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-6-staghorn-algae\/\"><span class=\"wp-block-navigation-item__label\">16.6. Staghorn Algae<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-7-aquarium-green-water\/\"><span class=\"wp-block-navigation-item__label\">16.7. Aquarium Green Water<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-8-brown-algae-in-freshwater-aquariums\/\"><span class=\"wp-block-navigation-item__label\">16.8. Brown Algae in Freshwater Aquariums<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-9-green-spot-algae\/\"><span class=\"wp-block-navigation-item__label\">16.9. Green Spot Algae<\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/16-10-water-mold-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">16.10. Water Mold in the Aquarium<\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"16.10. Water Mold in the Aquarium submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-10-1-white-fuzz-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">16.10.1. White Fuzz in the Aquarium<\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-11-aquarium-slime-molds\/\"><span class=\"wp-block-navigation-item__label\">16.11. Aquarium Slime Molds<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-12-red-spot-algae-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">16.12. Red Spot Algae in the Aquarium<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/16-13-a-few-aquarium-oddities\/\"><span class=\"wp-block-navigation-item__label\">16.13. A Few Aquarium Oddities<\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/17-aquarium-fish-selection\/\"><span class=\"wp-block-navigation-item__label\">17. Aquarium Fish Selection<\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"17. Aquarium Fish Selection submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-1-native-water-chemistries\/\"><span class=\"wp-block-navigation-item__label\">17.1. Native Water Chemistries<\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/17-2-biotopes\/\"><span class=\"wp-block-navigation-item__label\">17.2. Biotopes<\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"17.2. Biotopes submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-2-1-blackwater-biotope\/\"><span class=\"wp-block-navigation-item__label\">17.2.1. Blackwater Biotope<\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-3-blackwater-fish\/\"><span class=\"wp-block-navigation-item__label\">17.3. Blackwater Fish<\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/17-4-lake-malawi-cichlids\/\"><span class=\"wp-block-navigation-item__label\">17.4. Lake Malawi Cichlids<\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"17.4. Lake Malawi Cichlids submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-4-1-malawi-aquariums\/\"><span class=\"wp-block-navigation-item__label\">17.4.1. Malawi Aquariums<\/span><\/a><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/17-5-goldfish-aquarium\/\"><span class=\"wp-block-navigation-item__label\">17.5. Goldfish Aquarium<\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"17.5. Goldfish Aquarium submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-5-1-types-of-goldfish\/\"><span class=\"wp-block-navigation-item__label\">17.5.1. Types of Goldfish<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-5-2-size-of-goldfish\/\"><span class=\"wp-block-navigation-item__label\">17.5.2. Size of Goldfish<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-5-3-stocking-goldfish\/\"><span class=\"wp-block-navigation-item__label\">17.5.3. Stocking Goldfish<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-5-4-goldfish-care\/\"><span class=\"wp-block-navigation-item__label\">17.5.4. Goldfish Care<\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-6-guppies-and-livebearers\/\"><span class=\"wp-block-navigation-item__label\">17.6. Guppies and Livebearers<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-7-aquarium-bettas\/\"><span class=\"wp-block-navigation-item__label\">17.7. Aquarium Bettas<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-8-oscars-in-the-aquarium\/\"><span class=\"wp-block-navigation-item__label\">17.8 Oscars in the Aquarium<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-9-nano-aquariums\/\"><span class=\"wp-block-navigation-item__label\">17.9. Nano Aquariums<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-10-aquarium-shrimp\/\"><span class=\"wp-block-navigation-item__label\">17.10. Aquarium Shrimp<\/span><\/a><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/17-11-discus\/\"><span class=\"wp-block-navigation-item__label\">17.11. Discus<\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"17.11. Discus submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-11-1-discus-husbandry\/\"><span class=\"wp-block-navigation-item__label\">17.11.1. Discus Husbandry<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-11-2-filtration-for-discus\/\"><span class=\"wp-block-navigation-item__label\">17.11.2. Filtration for Discus<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-11-3-water-for-discus\/\"><span class=\"wp-block-navigation-item__label\">17.11.3. Water for Discus<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-11-4-food-for-discus\/\"><span class=\"wp-block-navigation-item__label\">17.11.4. Food for Discus<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-11-5-discus-pheromones\/\"><span class=\"wp-block-navigation-item__label\">17.11.5. Discus Pheromones<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/17-11-6-breeding-discus\/\"><span class=\"wp-block-navigation-item__label\">17.11.6. Breeding Discus<\/span><\/a><\/li><\/ul><\/li><\/ul><\/li><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/18-aquarium-maintenance\/\"><span class=\"wp-block-navigation-item__label\">18. Aquarium Maintenance<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"18. Aquarium Maintenance submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li data-wp-context=\"{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }\" data-wp-interactive=\"core\/navigation\" data-wp-on--focusout=\"actions.handleMenuFocusout\" data-wp-on--keydown=\"actions.handleMenuKeydown\" data-wp-on--pointerenter=\"actions.openMenuOnHover\" data-wp-on--pointerleave=\"actions.closeMenuOnHover\" data-wp-watch=\"callbacks.initMenu\" tabindex=\"-1\" class=\"wp-block-navigation-item has-child open-on-hover-click wp-block-navigation-submenu\"><a class=\"wp-block-navigation-item__content\" href=\"https:\/\/aquainfo.nl\/en\/18-1-aquarium-water-changes\/\"><span class=\"wp-block-navigation-item__label\">18.1. Aquarium Water Changes<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><button data-wp-bind--aria-expanded=\"state.isSubmenuOpen\" data-wp-on--click=\"actions.toggleMenuOnClick\" aria-label=\"18.1. Aquarium Water Changes submenu\" class=\"wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" viewBox=\"0 0 12 12\" fill=\"none\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M1.50002 4L6.00002 8L10.5 4\" stroke-width=\"1.5\"><\/path><\/svg><\/button><ul data-wp-on--focus=\"actions.openMenuOnFocus\" style=\"color:#005d94\" class=\"wp-block-navigation__submenu-container has-text-color has-background has-white-background-color wp-block-navigation-submenu\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/18-1-1-water-changes-in-depth\/\"><span class=\"wp-block-navigation-item__label\">18.1.1. Water Changes in Depth<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/18-1-3-water-change-water\/\"><span class=\"wp-block-navigation-item__label\">18.1.3. Water Change Water<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/18-1-2-aquarium-water-change-math\/\"><span class=\"wp-block-navigation-item__label\">18.1.2. Aquarium Water Change Math<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/18-1-4-softened-ro-di-tds\/\"><span class=\"wp-block-navigation-item__label\">18.1.4. Softened, RO, DI, TDS<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/18-2-drip-water-changes\/\"><span class=\"wp-block-navigation-item__label\">18.2. Drip Water Changes<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/18-3-cleaning-the-substrate\/\"><span class=\"wp-block-navigation-item__label\">18.3. Cleaning the Substrate<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/18-4-cleaning-a-filter\/\"><span class=\"wp-block-navigation-item__label\">18.4. Cleaning a Filter<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/18-5-heavy-stocked-maintenance\/\"><span class=\"wp-block-navigation-item__label\">18.5. Heavy Stocked Maintenance<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/18-6-old-tank-syndrome\/\"><span class=\"wp-block-navigation-item__label\">18.6. Old Tank Syndrome<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/aquainfo.nl\/en\/18-7-sick-tank-syndrome\/\"><span class=\"wp-block-navigation-item__label\">18.7. Sick Tank Syndrome<\/span><span class=\"wp-block-navigation-item__description\"> <\/span><\/a><\/li><\/ul><\/li><\/ul><\/nav>\n\n\n<p class=\"wp-block-paragraph\"><strong>Source<\/strong>: <a href=\"https:\/\/aquariumscience.org\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Aquariumscience.org<\/a> &#8211; David Bogert<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Any discussion of\u00a0ANY\u00a0filter requires a disclaimer.\u00a0ALL\u00a0commercial filters almost without exception tell the owner to replace the filter media! Replacing the Filter Media\u00a0is a Big SCAM!!!\u00a0<\/p>\n","protected":false},"author":566,"featured_media":101763,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[55862],"tags":[],"class_list":["post-101762","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aquariumscience"],"featured_image_urls_v2":{"full":["https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Review-of-Aquarium-Filters.jpg",733,376,false],"thumbnail":["https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Review-of-Aquarium-Filters-150x77.jpg",150,77,true],"medium":["https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Review-of-Aquarium-Filters-300x154.jpg",300,154,true],"medium_large":["https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Review-of-Aquarium-Filters.jpg",733,376,false],"large":["https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Review-of-Aquarium-Filters.jpg",733,376,false],"1536x1536":["https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Review-of-Aquarium-Filters.jpg",733,376,false],"2048x2048":["https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Review-of-Aquarium-Filters.jpg",733,376,false],"commercegurus-pdp-large":["https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Review-of-Aquarium-Filters.jpg",733,376,false],"commercegurus-plp-mobile":["https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Review-of-Aquarium-Filters-441x226.jpg",441,226,true],"woocommerce_thumbnail":["https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Review-of-Aquarium-Filters-300x154.jpg",300,154,true],"woocommerce_single":["https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Review-of-Aquarium-Filters-600x308.jpg",600,308,true],"woocommerce_gallery_thumbnail":["https:\/\/aquainfo.nl\/wp-content\/uploads\/2023\/12\/Review-of-Aquarium-Filters-150x77.jpg",150,77,true]},"post_excerpt_stackable_v2":"<p>Any discussion of\u00a0ANY\u00a0filter requires a disclaimer.\u00a0ALL\u00a0commercial filters almost without exception tell the owner to replace the filter media! Replacing the Filter Media\u00a0is a Big SCAM!!!\u00a0<\/p>\n","category_list_v2":"<a href=\"https:\/\/aquainfo.nl\/en\/category\/aquariumscience\/\" rel=\"category tag\">AquariumScience<\/a>","author_info_v2":{"name":"David Bogert","url":"https:\/\/aquainfo.nl\/en\/author\/david-bogert\/"},"comments_num_v2":"0 comments","_links":{"self":[{"href":"https:\/\/aquainfo.nl\/en\/wp-json\/wp\/v2\/posts\/101762","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aquainfo.nl\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aquainfo.nl\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aquainfo.nl\/en\/wp-json\/wp\/v2\/users\/566"}],"replies":[{"embeddable":true,"href":"https:\/\/aquainfo.nl\/en\/wp-json\/wp\/v2\/comments?post=101762"}],"version-history":[{"count":0,"href":"https:\/\/aquainfo.nl\/en\/wp-json\/wp\/v2\/posts\/101762\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aquainfo.nl\/en\/wp-json\/wp\/v2\/media\/101763"}],"wp:attachment":[{"href":"https:\/\/aquainfo.nl\/en\/wp-json\/wp\/v2\/media?parent=101762"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aquainfo.nl\/en\/wp-json\/wp\/v2\/categories?post=101762"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aquainfo.nl\/en\/wp-json\/wp\/v2\/tags?post=101762"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}