The Planted Tank Forum - View Single Post - substrate not holding plants
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Old 11-15-2012, 06:47 PM   #3
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you could add sand as a cap to the top layer of existing substrate. Over time it will filter down into the substrate below and fill up the spaces. Put wet sand into a cup and gently pour it out onto the substrate with the water still in the tank. Just wash/rinse the sand you use really well. No need to remove the existing substrate.
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