Urchin on an eating spree

[thatguy]

I have a black long spine urchin that has decided to eat everything. Yesterday I watched him eat a Kenya Tree and today I caught him halfway through a Yellow Leather frag that was at the top of some rock work. I can't find anything to explain this. I know he has enough to eat and he has never bothered anything before. Any ideas?

 

[saltyunderground]

Are you sure there was no algae in the areas where it was eating? Maybe it just looked like it was eating the coral. If there was no algae in the areas of concern, then do you have enough algae in the tank for it to eat? If you run out of algae, they may go for other foods.