I have a new Naso but he is QTed in my rock tank 33g way better than a 10g and there is a lot of hiding places he didn't eat much the first couple days but he now eats every thing he can find or is fed. He never did develop ICK which is good he is in the 33g for another week yet. QT everything and feed garlic with every meal as it is a stimulant if nothing else, there are people that don't think garlic is good to feed to fish but every fish have eats garlic soaked anything. I do believe it also boosts their immune system I also use selcon. None of my tank have gone over 80 yet I have not even turned on the air conditioner yet.
Bill