The Planted Tank Forum - View Single Post - Keeping algae off of white decorative sand
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post #17 of (permalink) Old 01-31-2009, 12:25 PM
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Join Date: Sep 2005
Location: Jakarta - Indonesia
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What I usually did for sand gravel :

Siphon out the top layer. Vacuum if necessary (usually debris may accumulate)
Place new clean sand over (if I have any unused stock) up to normal level or clean the siphoned sand in bleach (usually for several hours), wash well, rinse and put it back on top.
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