Down and dirty phosphate:
Know that it can get into your rocks and take a year to fill up; at that point your problems start showing up. So, export way more phosphate than you think you need to from the start.
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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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