Planted Tank Guru
Join Date: Dec 2017
Location: Elk Grove, California
Corydoras prefer to school with their own kind. In my experience, the smaller the size, the more they require in the group to express natural shoaling behavior. It is very common to see people recommend 6 corydoras as a starting point for a group in the aquarium, but I find that it depends on the size of the corydoras.
What is your tank size and what fish do you already have?
180 g. low tech w/ wild South American cichlids, corydoras eques, and African Congo riverine tetras.
60 g. low tech w/ F1 Alenquer pair /Stendker "Tefe" discus and wild Altum Angels
30 g. low tech w/ Wild Tucano tetras
30 g. low-tech African Biotope