Matted Filefish(Acreichthys tomentosus) has noted above. I have used one prior with great success. Took about a month but it made short work of everything. Also ate pellet food and mixed frozen (brine, mysis). Even nori sheets. Would still have him today but once he started on my Xenia that was it. It was just a starter frag that didn't have a chance to get going so had to choose. Side note mine did pick at my hammer coral(s). They are established so while they reacted they never had issues and seem to manage the nip here and there.