first off what type of water are using for new saltwater and topoff. if it is tapwater then i would say definitely thats the problem. if its ro/di water test the water before it goes into your tank and see if thats the problem. hair algae takes over from high nutrients, find the source and cure the problem. sometimes testing your tank water doesnt help cuz the algae eats the nutrients so fast you cant register it on your test kit
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