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8.0 ph

  1. Beginner Freshwater Aquarium
    I have well water that tests 6.4 out of the tap. It's not hard. (the fish store said it's about mid range for hardness.) My problem is that the next day this water will test 8.0! (using the API high pH tester.) This is the water in the aquarium and in a glass of water just sitting on my...