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#4
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I was just reading about how phostphates bond to calcium carbonate in the sand and you should replace every 2-3 years(A post in RC i can't seem to find again). I don't know about this one though, since well the sand in a real reef i'm sure is a "little" more than 2 years old. Worth looking into though. FWIW I reused my sand with no issues.
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