I think I’m set on the channel, but bullheads are certainly a cool species!i cant speak for channel but i know for sure that an adult bullhead will leave everything above 12cm alone. They are always hungry but wont even try a fast fish like a cichlid and def prefer pea's or shrimp over a live fish. as said before they really scavenge and dont really hunt. Mine was a friendly giant atleast. I even was able to keep 8cm small bichirs with him while he was around 30cm
This reminds me - there is a certain place in Lake Poway where there is an albino catfish. You can see him periodically throughout the day in this one area. He’s around 15”, and the ranger said that this is one of the only one that he see’s often. Really interesting animal from above.