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    High nitrates, but water changes don't help. Any ideas?

    I have a 55G tank with plants and a bunch of shrimp and fish. All my water values were always stable, but I had to put in some Nitrofurazone and API Pimafix (separately, about a week apart) to try to fix some cotton mouth on a few of my neon tetras. Now I constantly have high nitrate values...
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