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Fertilizers and General Hardness

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Hi everyone,

The water in my planted tank is testing in the range of 150 ppm GH (I'm using Aquarium Coop test strips). I don't have any rocks or substrate in that tank that would raise general hardness so much, so I am wondering if it's the fertilizers. I'm using ADA Green Brighty N, Neutral K, Iron, and Mineral. Coyld any of these affect GH? (Note: I was using Green Brighty K until a couple of weeks ago when I changed to Neutral K, but the GH high levels persist).



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