So my regal tang is ill. I got him about 10 years and in this time he was ill maybe 5 times. Usually when I saw something on him I add Polyp lab reef safe medic for few days and he was fine. This time he is already after one week of adding the polyp lab medic and melafix&pimafix. He is eating fine just still have something on his body. I don't have QT so I can only use medicine that's reef safe. Is there anything I can help him? Freshwater dip?? I never did it so no experience in that. Will this help him or stress him more?