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Little known info: Bubble algae concentrate nutrients into the bubble, and thus can survive for a while with no nutrients in the water at all. And bryopsis uses actual roots that extract nutrients out of the rock, also, when there are no nutrients in the water.
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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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