They look like some kind of worm / feather duster, and they keep making the zoa close up. Does anyone know what they are and what might be the best way to get rid of them?
It looks like feather duster worms. They shouldn’t be making your zoa xlose though. I have like hundred in my tank all over everything and they don’t cause my Zoa or any other corals to close. I’d bet there’s a different issue. But if it turns out they are the problem just break the tubes with tweezers. The worms rarely survive tube destruction and will die.