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  1. How can you find out the hardness of aquarium water?

    Beginner Freshwater Aquarium
    I have a API Freshwater Master Test Kit that shows me the ammonia, nitrite, nitrate, pH, and high pH levels of my water. I was wondering how to tell the hardness of the water because under a lot of the fish profiles here it says they need certain degree of soft/hard water. Thanks. Ps. Is there...