I have this scopas tang in a 95 gallon tank and all the water parameters are spot on, the tang has black spots on its fin and it’s slowly creeping down to its body, it’s had these things on it since around November and I’ve tried treating with prazipro and that didn’t work and I tried melafix and Pimafix and that didn’t work either, the fish seems to be alright with it, he eats whenever I feed him and just seems normal but I’d like to find out what’s wrong before it spreads more. Thanks to everyone that reads this