Don't do hypo and copper. If it is ich, pick one and go with that. What I can see though I have no guesses about. Hopefully someone else will chime in soon. Good that you have him in QT. Keep him as comfortable as possible (dim lighting, super clean water (watch PH closely) and cover the tank so he is not disturbed. Best I can do for now.
Post as many details as you possibly can, so the disease experts can have more info to work with.
Tank parameters, age, other fish, any changes recently, feeding habits, anything and everything you can think of. Feeding habits, anything.