Well. I have new research..
OSFFs DO EAT CORALS
haha I have one and he has absolutely dominated 8 good sized colonies. One of which was a 12"x 12" colony of monti cap. At first I just noticed lack of polyp extension, but since I didnt have any extremely expensive sps, I figured I would let this experiment play out. He ate them all. Birdsnest, monti cap, encrusting monti, Digitata, bali tricolor, assorted acros, green slimers, and poccilopora. all gone.
Now ya know