With any fish that says reef safe with caution, that's what it is telling you to be cautious about it because it may eat corals. Someone may have one that does not bother their corals at all and then there will be another that it ate most of their corals. With fish like that its a gamble. If you keep them well feed, then I have read that they will be less likely to eat the corals. How true that statement is, is anyone's guess. It may work out for you and the Koran may not touch your corals, then again you may get one that does. Its really your choice if you want to take that chance.