Ok, a friend of mine is taking down his tank. He has what he is calling hydroids (see image below). It is mainly on the bare rock and if there is any on the rock with coral it is minimal... should I chance it? I would be taking the ricordia in the image (I would pop it off the rock its on) and a zoa colony or two. I dont see much if any on the zoa rock... Opinions would be greatly appreciated!
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