When I first got him, about a year ago,
I had a good size yellow tang and a good size Dori, I had him in QT for about a week and here came the ICK, He was covered, I did fresh water dips with cuppermine for about a week/ twice a day. I was never to worried about him cause he was eating well. ( Brine/Mysis soaked in garlic xtreme ) I also do daily water change's, so 2 gal from main went into the QT tank daily, thus no shock acclimating him. As soon as he was in my yellow went right after him, would have killed him for sure. I decided to remove the yellow for a while so he could settle in. And he did, my water back then was'nt perfect, but I did have enough room for him to swim, ( and swim he does ) I'm not sure, but for me I think the garlic xtreme soaked food made him eat like crazy right from the start, I still soak all my food and have'nt had any eating issue's, A Fat belly, good water, and good flow is a perfect start. Even my cleaner wrasse eat's everything.
Oh, bye the way the yellow never made it back into the system, traded him to a buddy and I see him every once in awhile, he;s in a 220 now. I hope this help's. Whatever you decide, GOOD LUCK!!!