The Planted Tank Forum - View Single Post - Does Flourite increase tank GH?
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Old 11-21-2013, 06:39 PM   #10
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The table that Roy kindly provided shows that Flourite does contain some Ca and Mg which contribute to GH, but not in high amounts compared with many other substrates. I guess I will just increase water change frequency and hope that my run-away GH tops out and eventually declines.
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