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Each 12 square inches, with proper light on each side = 1 cube. If light is on one side, then it only = 0.5 cube because the roots will die faster.
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Inventor of the easy-to-DIY upflow scrubber, and also the waterfall scrubber that everyone loves to build:
http://www.reefcentral.com/forums/showthread.php?t=1424843
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