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Speaking of growth on the glass, here is an upflow scrubber looking through the sump glass, with the growth light removed. The strings are shown touching (and rubbing) the glass, and when bubbles are rapid this has the effect of cleaning growth off of the glass so that more light gets through.
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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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