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I'm guessing you still have high phosphate. I use gfo and phosphate adsorbing filter pad to keep my phosphate in check. I used to have hair algae but slowly over a 6 months time it's gone. I would increase your wc amount also to export out as much nutrients as possible. I have a Fluval 5 gallon reef and I do 75% WC every 2 weeks, that's a full 5 gallon new water going in every 2 weeks.
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