What's wrong with this elegance coral?

[kien]

Maybe the rabbit fish picked at it well before it got to this state and you just didn't see him doing it. Possibly at night or simply whenever you turn your back. I've had fish do this and would only catch them in the act if I had a camera on the tank. For some reason they would not pick on the coral whenever I was around. Fish are weird.

Anyway, it just seems too coincidental that the elegance is fine, then add fish and suddenly elegance has all it's tentacles chewed off??