i have 2 in my pond. they get huge. it is possible if you have a huge tank. they eat anything and everything, so if you have anything smaller than it it will be eaten. the real problem is they get huge and don't like being the only channel cat in the tank, so you would need at least 2. or so i've heard. you might be able to get away with 1. they nip fins. as CM said, you better have a big tank, and do a google search for them, you find all the info you need.