The catfishes of the bullhead group are very agressive, grow much faster, and are just plain ole more onrey. I have a 55 with a chanel cat and a white bullhead. The bullhead rules the roost. Be careful with the bullhead, they grow fast and will very soon, if not now, need a larger tank.
BTW, I am a natives fanatic, if you ever have any questions, I've kept many species of cats, minnows and centrarchids.