Yes I agree with Fisharnekked!
Bullhead cats are not aggressive in the sense that they will go beat up on other fish. But naturally, if it can fit in his mouth it will be gone soon. I would recommend anyone keeping Bullhead Catfish to have a tank either 100 Gallons or bigger and also it is best to keep them with "Native Fish".
I dont advise anyone to keep Bullhead Catfish with precious tropical fish because they will end up having them as a meal at some point or another.
Most North American Native fish in the Catfish family tend to grow very quickly.
I made a common mistake buying a Channel Catfish and I am housing him in a 75 Gallon. I got him at 4 inches and he's almost at 11 inches 10 months later.
I am pretty sure people who keep Channel Cats know that they grow very fast. Luckily for me, I know any Aquarium store in Long Island that is willing to throw him in a giant pond when I can no longer care for him anymore.
Anyone with 100 gallons or smaller I would suggest Madtom Catfishes.
Oh yeah they grow upto like 18 inches or something like that.
This is my 2 cents regarding Catfishes.