These fish are eating machines. I bought a Doliatus rabbitfish (same family as a foxface) to rid my tank of grape caulerpa. I had ALOT of the stuff growing absolutely everywhere. Within 2 weeks, the fish totally mowed the whole crop down and will shred any I expose while doing maintenance. If you have the room, it's a great fish for a reef tank. Some however, have been known to snack on a few meaty LPS like open brains.