I’ve had mixed experiences with bullheads and other fish. Earl didn’t tolerate any other fish in there with him. I had to put a 6”+ bluegill in with him and for a few weeks and he let it recover, from getting beat up by another bluegill, then one day I came home and Earl had eaten it’s eues out lol. Currently I have a 6-7” yellow bullhead in with some sunnies and there aren’t any problems.