So I was flipping through my guide to fish/plants, looking for specimens that would be good in hard water, and I found something called a banjo catfish that supposedly does well in hard water. The few sites I whipped through today indicate that it is a fairly small fish, about 5-6", and peaceful even with small fish. Is it true? And how rare are they? It looks like an awesome fish if it would work out w/ tetras, mollies, and corys.