Otocinclus: Oto Catfish Care Guide ...
Otocinclus: Oto Catfish Care Guide & Species Profile

How many cory catfish should be kept together?

Six or more cory catfish should be kept together. Cory catfish are small fish and feel safer and happier living in a school of at least six.

Cory catfish will only form a school with other corys of the same species, so you should keep just one cory species in a tank.

You should also consider your tank size when deciding how many cory catfish to have. As a general rule, an inch-long fish requires around one gallon of water in the tank. Thus, depending on the cory species, you can keep between five and ten cory catfish in a 20-gallon tank.