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It was Bryopsis which someone else mentionedLooks like hair algae or turf algae. Could do a hydrogen peroxide dip on it. Do it quickly and the zoa will be ok
Thank you! After researching the other answers posted, you're correct! Finally a forum for actual responses and accuracyBryopsis which is a nuisance algae. Pull as much off as you can by hand and liquid vibrant is great in getting rid of this. Also reducing white light intensity will help