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Even with no water changes, I used to never consume much mag. Got tired of testing unchanging numbers. Just seemed to stay up, except every year or so it would suddenly be low when I remembered to test again.
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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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