I have one, and i have had it for several years. I have never seen it eat any corals - I have softies, lps and sps.
However, mine is a very grouchy fish, and it is always chasing other inhabitants of my tank. I often see chunks of fins missing on my other fishes, and I believe that is from the Asfur. Mostly, it seems to chase my Moorish Idol, and secondly my Indian Trigger. I have strongly considered removing it from the tank, but whenever I finally get fed up and get ready to, it seems to behave itself for a while until I change my mind. Then it starts back being mean again. Of course, that may just be mine's personality, and not necessarily indicative of the species in general, but that has been my experience.