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You'd be surprised in how much flow they can handle. This may have various effects on feeding/prey capture rates though. Lots of gorgonians will shed there outer skin layer, though I've never seen diodogorgia nodulifera to do it. Not sure if this is the best advice but I've heard of some people physically rubbing (gently) it off. Other than that trying to keep it in a darker part of the tank is your only real option. But generally its not hair algae but probably diatom mats that can get kinda whispy looking if they get really built up.
Aaron
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