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[APD] OUCH! Water so hard you could knock on it!

My tests have shown the water in my aquarium is 24 degrees GH, 4KH. I tested the tap, which revealed 2GH/KH (I raised KH with baking soda). I have natural gravel, a large lava rock and laterite. Filtration is done by bio balls, and I use compressed CO2. What could be causing this and how do I get it to a safer level?

-Dave T.

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