Are you using ro/di water? Check your source water and freshly mixed saltwater to make sure you arent dumping nitrates back in to the tank. My ro/di tests positive for nitrate at 1 tds.
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I have never needed an Algae scrubber, and had 0 nitrates within 1 month of adding the 6 inch sand bed. I quit testing after a while because it was always 0. Now I just need a natural way to keep my phosphates in check without buying Rowaphos.