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Old 11-22-2008, 03:33 AM   #8 (permalink)
Left C
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I once used 400 cubic inches per bag for my calculations of regular Flourite (48" x 13" x 3" ÷ 400 cubic inches = 4.68 bags).

Here is this site's substrate calculator: http://www.plantedtank.net/substratecalculator.html

So, 4 or 5 bags will be enough for a 55g.
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