As stated above plus...they'll eat most anything meaty from cyclopeeze to krill. I've seen 2 liter bottles cut in half placed over them to protect while feeding but if they're healthy they eat quick enough where I just stand gaurd with the turkey baster and "shoo" any of the fish, shrimp, hermit scavengers away.
Overall, not a difficult coral to keep...its the expense of them that makes us leary.