I have a scopas tang that I got about 2 years ago and ever since then his fins have been eroding, I’ve tried pimafix, melafix, prazipro, copper power, vitamin supplements, none of those work. All the tank specs seem to be on point, all the other fish are happy and healthy, I feed him nori, plankton, pellet food, mysis shrimp, and brine shrimp. he eats everything but the brine shrimp. His fins are getting really bad now and he’s losing scales, I’m scared it’s going to get so bad that he dies, thank you to everyone that helps out!