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Unread 01/14/2016, 09:29 PM   #7453
SantaMonica
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Join Date: Feb 2007
Location: Santa Monica, California, USA
Posts: 2,511
Because adding white to the black is a hard extra step.


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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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