Yikes!!! Thanks for the info.I pluck any that I see out of my tank. They drive the zoas crazy and they do eat them, I have seen huge colonies disappear within 3 months. If you can get the rock out, do a fresh(RO)water dip for a minute or so, then shake the colony in clean saltwater to get those stars off the colony. They should be fine and star-free after that.
Yes, without a doubt certain asterinas WILL eat zoas.
You could purchase a Harlequin shrimp or two and they will eat the asteria population. The downside if after they eat all of the asterinas you will need to continue to feed them live starfish as that is the ONLY thing that Harleys will eat.
yeah those harlies will do the job only bad thing is that once there done wit those stars they will need to be fed atleast sometype of star everycouple of days or else they will die happend to me