Oh okay that's what it is... It seemed like they were eating off the glass when I got it... But now that I know the name I will research some more...Do you think it will eat acroporas??
I'm not sure, probably not acros, maybe more like zoa's and LPS.
Just give it some shrimps, mussels, meaty things to keep it happy.
I don't see a lot of algae in your tank, so it's real important that you feed it.
Otherwise it will starve or make snacks of whatever it can find to eat.