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what are your exact water parameters lighting shedule, flow, etc...? Sounds like Cyano to me. How long has the tank been set-up? Do you have any dead spots regarding flow? Overfeeding? what is your water change amount and schedule? Do you test for Phosphates - this is more than likely your problem and it may not even register on a test kit due to the fact that the algae absorbs the Phosphates almost immediately. I'd remove as much as you can by hand and make sure your flow is up to par. A 20% water change every 2 or 3 days for a couple weeks will work wonders for you too.
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