I got a yellow bullhead thats about 6". He's a bit of a bully and I had to throw him in the pond. When he was in the tank with 3" blood parrots, 3" oscars a 4" Clown knife and a 12" channel cat, he beat up on everyone. I've never had a bullhead before so i'm wondering if all bullheads were this aggressive. If he survives winter, i may try putting him back in the spring when the others are bigger. I just got a 1" spotted bullhead that i'm going to try in the tank when it is about 3".