The Chihiros Doctor is a device used in planted aquariums to control algae by generating hydroxyl radicals through electrolysis. While it appears to be a modern solution, it essentially produces hydrogen peroxide, which can harm fish gills and other aquatic life. The device’s marketing claims suggest it promotes plant growth and improves water quality, but many experts caution against its use due to potential toxicity to fish. It is recommended for plant-only aquariums, but its effectiveness and safety remain controversial.








