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high nitrites

  1. high nitrites

    Beginner Freshwater Aquarium
    I redid my 55 gallon tank last Saturday. Since the filter was cleaned pretty thoroughly and was just sitting in a bucket for a few hours, I decided to check the parameters. Ammonia is 0, but nitrites is 0.25. Was this because my filter was a bit disturbed? How worried should I be? is this level...
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