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nitrite poisoning

  1. Nitrite Levels

    Beginner Freshwater Aquarium
    I'm struggling to lower the nitrite levels in my fresh water aquarium (20 gallons). I've done several water changes (about %40) ever other day and the nitrite levels do not go down. I use Tetra Easy Strips to test the water (Nitrates, Nitrites, Hardiness, Chlorine, Alkalinity and pH). I've have...