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  1. Hardwater Fish?

    Beginner Freshwater Aquarium
    Hello, I have a 30 gallon tank. It has black sand and for deco has all natural rocks. The pH is 8.0 +/- .2 The water is extremely hard (although I have no proof as I don't have a test kit for that) I already have 10 white cloud mountain minnows. I'd really like to know if there are any...