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I bet your Mg is low in the salt you are using for your water changes. The best thing to do is setup to do a water change and measure the Mg, Ca and alk of the new freshly mixed water. Most times you will have to adjust the mix to meet what you are trying to maintain in your tank. Once you start doing that you should see less swings in your parameters.
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-Joe
TOTM Sept 2002 | Reefland April 2004 | CORAL Magazine Nov 2007
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