Mine took a while to completely clear up. The one thing I did find was onc e the hair algae went the cyno kicked in. Probably all the nutrients from the dead algae had to go somewhere. If I were you I would turn my skimmer back on immediately to help export some of those nutrients. I would also hold off dosing again.
Just because the algae is still there is it actually growing actively like it did before. What you might find is the algae is still there but not growing and will eventually fade away into oblivion. Do you have any herbivores?
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