I'm still sceptacle about this....I know we've had this discussion alot of times before.
I do concede that they will eat corraline, although I've never personally seen it. (and I have a ton of these things in my tank) But I've seen more than one person say that they eat Coralline. So I'll concede that point.
As far as eating coral flesh, I've never seen that either, and I've got plenty of coral and plenty of asterinas, you'd think at some point the 2 would meet.
I still think these little stars, (while certainly a pest)...are getting a bad rap for things they're not actually doing.