Thats definitely some interesting growth patterns for an algae. It looks green, but it could be macro instead of hair. Have you tried touching it? I find that hair algae tends to be more slimy, as opposed to macro which doesnt really feel that way.
I would siphon it off, or brush it off with a tooth brush (last resort, provided you have good flow and strong skimming).
Perhaps you could post a picture that isnt so blue, if possible? Kinda makes it hard to see the green
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100 Gallon Reef, 2 x 250 Watt HQI Giesseman 13000K, Reeflo Dart(3600 gph), E.T.S.S Reef Devil Deluxe, Ocean Clear 325 filter, Aqua UV 25 watt, Korallin Calcium Reactor C-1502
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