Don't know what your Alk is at,but you can try raising it to around 10-12.Algea doesn't like the high Alk.Also take a small piece of algea covered rock and clean it off.Then put it in a bowl with fresh made salt water.Let it sit a couple days and test for nitrates.It seems that everything you have done so far should have had at least some effect,so maybe your rock is whats causing the problem.
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