So today when i looked at my tank i noticed my tem has a circular patch of skin on his tail right above the occelaris that is gone. I can see the individual rays of bonse of the tail and also there is a tiny hole that goes throught the tail in another part of it. What should i do? Ive already added salt and the temp is already at 84. Is it ammonia burn? but none of my other fish have it. Also i did my usual 75% wc today. I can get pics if it will help