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A Feasible Reactor for doing Anoxic Aquarium Filtration is possible but not worth the effort.

Testing of Biocenosis reactors shows they don’t work!

Anaerobic or Anoxic Reactors as an Aquarium Filter cannot reduce nitrates to nitrogen gas, this article shows why!

Filter and Media Design for Aquariums: how to calculate the size and media for your aquarium filter.

Small DIY Aquarium Filters: this article shows some 16 different alternatives.

Bottom of the Tank Matten filter consists of a combination of under-gravel plates with a substrate of charcoal colored foam instead of gravel.

Small Filters for the Aquarium only do decent filtration in small aquariums with small numbers of small fish!

Do it yourself Aquarium Bottle Filters are very cheap to build. They are also very poor filters.

Diatomaceous Earth Filters could be used to filter out ich, parasites and bacteria. However the filter plugs very easily and is no longer produced.

Hamburger Mattenfilters can give good filtration but they are ugly. They are a cheap option for smaller aquariums.