If he is in your 54 gall he is stressed and needs a bigger tank, You can try secon or some other vitamins, want are you feeding it? Is it eatting? this hole thing is not good , 11 fish and a tang??????????
54 gallon corner bowfront with 50lbs of live rock, 11 fish plus inverts & 25 lps, softies & polyps
Interests: Can't stop buyin' crap for my tank