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  1. Treating RO/DI Water for Freshwater

    Beginner Freshwater Aquarium
    Sorry if this has already been asked, but I’m not finding any good answers for my situation… I am using RO/DI water for my freshwater tropical tank, with no plants. I’m using RO/DI water because my tap water has unusually high nitrites, making it very difficult to maintain ideal conditions...
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