Thats a royal tuxedo urchin.Thats a great reef urchin(one of the few I would suggest putting in a reef setup).Thats a good hitchhicker for a change. Don
He will eat coraline and any other algae he can scrape off of the rocks or glass. Depending on clean you keep the glass. I have had for one for years, I have never had to feed him anything. He will scrape out a living on his own. :lol: