This came off during the dip cycle of my montipora. Any clue if bad or good? I'll keep him in my mini-quaranteen tank for a while, kinda like him regardless of outlook.
I found something very close on an old Wet Web Media post - looks very similar but unfortunately they don't give a positive species ID. It's about 2/3 the way down the page titled "Stylophora pistillata hitchhiker: Xanthid crab? "