The Planted Tank Forum - View Single Post - HC and Flourite in low tech tank?
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Old 10-12-2012, 02:12 AM   #4
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Sand doesn't cap over fluorite--sorry. Finer particles will always filter down; generally far faster than you would ever expect.

Also, HC *can* produce a carpet without c02, it just takes a lot of work and patience--more than most people want to put in.
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