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Pumping xenia or waving hands. Not the scientific name, but it's the general fish store name. I got a few from a friend and they did great and spread all over the place. I traded them at the lfs for other corals. My profile pic is one of thoes corals I got for trading some in.
Sorry, I didnt notice them. I dont think they would hurt them. The xenia dont have a sting to em and I've never seen em eat any thing. I think they just get what they need from the light.