Freshwater Fish Care Guides — Species Index

How to use this index

Care sheets call out boring, unglamorous needs—room, temperature, school size—before anyone sells you a colour morph.
Tank-mate guides sort fish by temperament and how long the tank is; skip the “anything peaceful goes” trap.
Short pairing pages say yes, no, or only if—and hand you the calculator when it gets messy.

Tetras & characins

Need a fish you do not see here? Use the species search, then plug names into the calculator before you buy.

Browser calculator stays free. The app only matters if you want several tanks, photos, and test history on your phone.