The Planted Tank Forum - View Single Post - Brown diatoms in mature tank (ARGH!)
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Old 10-01-2012, 11:35 PM   #8
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Diatom is caused by the presence of silica in the water, substrate, and sand. Since the tank is matured (not sure how long you have the tank), the silica has to be be introduced from the tap water, water change. You can get Phoslock to remove both phosphate and silica before doing your WC.

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