Hello all, I have a juvenile purple tang. I've had him for about 6 weeks. I bought him from a reliable fish store that quarantined him for 3 weeks treated with copper. I have never really seen him eat anything. It's been 6 weeks, so I know he must be eating something, maybe algae from rock, but I never actually see him do it. He doesn't eat flake, pellet, nori clip, mysis shrimp. He seems perfectly healthy, other than a sunken belly. He swims fine, although seems kind of clumsy, bumping into rocks sometimes. He doesn't have any vsible signs of disease. I had a foxface before him, and added a white tailed bristletooth at the same time as the purple tang. They all get along fine, no aggression. Any suggestions on how to get the tang to eat what I'm feeding?