If it forms a thick woven blanket, it might be turf algae. Either way try reducing your nitrates and phosphates. Foxface will eat it as will some tangs.
Have you checked your nutrients?
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210 Gallon slowly gaining population.
Foxface, Naso, Coral Beauty, 2 Clowns, 2 Chromis, Orange Anthias, and Striped Goby.
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