Bravo for using a QT tank, it's rare that people do it but we all know we should so pat yourself on the back.
In my opinion the fish should go back, I guess it depends though on what size tank you are planning on keeping it in. I don't believe that fish only grow as big as the tank they are in allows them to even though a lot of people will tell you that it's true. Sometimes the LFS staff speaks from experience rather than what they read or what the common behavior of the fish may be. So just because they haven't seen a koran angel eat coral doesn't mean it's not it's nature.
Doug
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