He got many f/w baths as well as Prazi treatment (twice), GC in food and QT water column, then copper in case it was something not cured with prazi and recently hypo salinity for 4 weeks. If he has flukes after all that we are in deep you know what.....sounds like it could be flukes to me, appetite loss, glass surfing. I treat all fish coming into my tank now for flukes and internal parasites, its seems to be super prevalent in the supply chain lately.