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35 was just found after building many of them using a single sheet of plastic canvas.
GFO can slow down a scrubber. Better is to just reduce nutrients slowly, and get a sand sifter of some sort. cyano will go away eventually.
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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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