Like i said there is a number of fish you can keep, you just have to make sure that the fish are at least 3" long because your bass will eat anything that will fit into its mouth. Mine are mixed right now with sunfish that are to big to fit into there mouths and i have a channel cat in there but this is a native tank, i have had them mixed with a pair of Texas chiclids and JDs, plecos, a lg Tilipia but had to move them out because the Bass was becoming King of the tank, that was like a yr ago now all my natives live in a indoor pond eating of convicts as food