If he is otherwise healthy, he will be fine. I have 4 tangs, and the hippo tang in particular thinks it is fun to run as fast as he can from one end of the tank to the other then dart into the rocks. He has gotten gashes all over the place from the rocks and SPS corals, even split his tail one time, but he must think it's fun 'cuz he keeps doing it. And he has been doing it for over 3 years now :). Crazy fool never learns. LOL!! Anyway, he always heals up, even his split tail heals.