Well, I tried to quarantine it, but it was really stressed in the QT, so I let it in my main tank. Basically, try as much variety of food you can to get it to eat. I tried cyclopeze, ROE, mysis, brine, arcti pods all blended together as well as pellets. I also soaked all the food in garlic. It took me a week and a half to get it to eat and it first ate pellets, then slowly started trying the mysis and now it eats anything. The trick is to introduce as wide of a variety as you can to get it to feed and it'll eventually start feeding on whatever you give it. And during this stage, overfeed the tank so it has a lot of opportunity to feed, I think that was a big part of my success. I fed pretty heavily for that first week and a half.
Good luck! They're definitely beautiful fish! And Tony's fish, which are caught by divers in Hawaii (doesn't go through wholeseller) are pretty healthy and have a good track record of being healthy.