Don't give up on your CBB fish completely. I have an 80gal Nuvo, but with the sump on the back of the tank and loaded with live rock, fish, and corals the displacement makes it about a 55 gal tank. By CBB is doing great!! I feed her/him minced clams in a piece of small live rock with plenty of holes, and put the clams in the holes and it will have no problem filling the belly. You just have to fend off the other fish, while the CB eats. Every other feeding I hold a cube of brine shrimp in my thumb and forefinger and my CBB will eat right out of my hand, along with my Long Nose Hawk fish. I have a video, but I can't figure out how to download it.