My yellow tang's fins are like halfway gone; I assumed something was "nipping" at them, and I also assumed they'd grow back-well--that was like nearly a year ago-he seems happy and healthy, just would like for his fins to grow back. I feed them prime reef, green algae flakes, and also seaweed clips about every-other day. So, he should be getting his nutrients he needs-do ya'll think that something is still "nipping" at him,? shouldn't his fins grow back? I don't wanna throw him away or anything, but would like a nice -looking yellow tang-any suggestions?