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Decided to let my screen go 14 days instead of the usual 7 day scrape
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That's about as long as a waterfall screen can go, before root die-off. And even then, the growth needs to be light green.
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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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