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If a screen has lots of growth, then it is rough enough. Removing nutrients just takes time.
If a 6 x 12 heatsink has LEDs all the way to the edge, and it placed 6" from a screen, then the screen could probably be 10 x 14.
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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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