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I get the screen is big but it would at least start growing some GHA on it, wouldn't it?
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No, there won't be enough nutrients in the water too build the algal ladder strands that need to reach out past the slime into the flow, so the slime will dominate.
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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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