The Planted Tank Forum - View Single Post - Flourite vs Onyx sand
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post #3 of (permalink) Old 09-06-2003, 06:46 PM
Are these real?
Wasserpest's Avatar
Join Date: Jun 2003
Location: Monterey, CA
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I also heard that Flourite contains and supplies iron, while Onyx sand doesn't, but adds a little hardness to the water.
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