Well welcome to the world of reef keeping and reefcentral as well. Infortunately you chose a very very difficult fish to keep in a new tank and having little experience keeping fish. Even the most seasoned aquarist will have difficulty with these butterfly's. The best suggestion i can give you is to try and replicate their feeding behavior in the wild. stuff small pieces of clam, mysis and other meaty foods into the crevices of your rock work. In the wild they roam the reef and pick at small inverts, tube worms, etc that other fish can not reach. With the butterfly's long specialized feeding mouth they can reach therse food items where others can not. So you need to try and replicate this in your tank. Also getting a small ceramic dish and placing live black worms can sometimes entice them to start feeding. You can also try live brine. Also make sure if he has any other tank mates that they are very docile. As a suggestion do as did here and ask questions about a fish, but do it prior to buying the fish. Good luck and hope this helps. Regards, Tim