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tested 0, i'll get a picture is there another way to lower my nitrates? like adding ALOT of macro in the display or something like that?
Adding macroalgae is not a viable way to reduce nitrates. Especially in the long run, it’s important to look at why they are there in the first place and try to fix the problem at the source. The best way to reduce them at this point is multiple, regular, large water changes.