non-schooling fish

Hello all. I have a 20 gallon tank with 5 Corydoras Catfish. I wanted to get a middle to high swimming fish in the tank to add variety. Since I already have 5 fish, I didn't want to add too many new fish to prevent overstocking. But many fish I have researched are schooling fish and prefer to be...

Hello, i have a twenty gallon tank that i would like to add a catfish into. I have seven guppies, a snail and a red cherry shrimp. Is there any species of catfish that i can keep with my fish and inverts without having to get a whole bunch of them. I want only one, not a whole bunch, just one...