Re: What kind of catfish can go in a 10 gallon?
Actually, all but the largest of the Corys will do quite well in a 10 USG tank. Depending of the entire bioload of the tank, 3 to 4 Corys or if it's a species specific tank, up to 10 Corys in a well maintained tank is no problem at all.
Many of my 10 USG Cory tanks house up to 20 adult Corys, without problem. Frequent water changes and a clean tank bottom are what you need to concentrate on.
Just my experience. You mileage, may, of course, vary. - Frank