I was also having issues with hair algae. I've had issues with nitrates and phosphates since I started my tank a few years ago. Nothing I've done has really brought my numbers down to an acceptable level. Not sure if it was just a crappy batch of rocks or what. But looked into some kind of carbon dosing and came across red sea's 'nopox'. Been using it not quite 2 months now, and my levels are now near 0. My hair algae thinned down to the point where a turkey baster can blow it off the rocks. I do that once a week and catch the floaters with a fish net. It's more expensive than vodka or vinegar, but has worked awesome in my tank.
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