I can tell you as an owner of a brown bullhead at 12 inches that lives in a 75 gallon breeder, it is not sufficient enough. Even though my catfish looks comfortable and moves with speed and agility with ease, he needs more room. I will advise that you do not feed fish to your group, I believe that it encourages the catfish to actively hunt your other fish. Minimum tank would be a 125 gallon but even bigger is best.
Here are two videos showing this catfish, watch in HD:
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