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More harvest mass = more filtering. That's what you want. If you don't mind less filtering, just let it go more days; roots will die and start letting go, putting some nutrients back into the water which will appear to you as less filtering. But it will still filter.
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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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