about 3 weeks ago I got a purple tang and a BPT. I put them in QT and they were in there for 2 weeks. Everything seemed to be fine. Both fish were eating there was no aggression. I didn’t have any copper or anything else in the QT. I had rock in there so I didn’t see the fish too often. They liked to hide. So I took the rock out and added pvc pipe so that way I could add copper to treat for any potential disease these fish could have. When I added it the PBT seems to be fine but my purple tang just sat in the bottom corner of the tank and didn’t swim. I didn’t see him eat anything. He was in the copper for 3-4 days. This morning I took him out and introduced him to my DT because I didn’t think he was gonna make it. When I did this I placed the fish in an acclimation box. The fish just proped him self against the wall and didn’t move. After about 45 mins of being in there I released him into the tank. He is swimming but slowly and stays at the surface of the tank. I went to work for about 5 hours and just got home and he’s doing the same thing. I fed my fish but he didn’t seem to eat. I placed some nori on a clip where he keeps swimming but he hasn’t touched it yet. The fish looks super skinny now. Not sure what to do. Any suggestions or help would be great