My Yellow Polyps are covered from their base out about 6" from the colony in all directions with this fuzzy mat with like airholes in it. I'm guessing it's them spreading. How do I control them? They are on a large rock and the fuzz is getting up next to other corals. I don't want it covering my favorite zoa's. Is it them spreading? What do I do? (I think they are yellow polyps, not yellow star polyps.)
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