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Originally Posted by reef_raf
if it's that low, a whater change should do it.
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Depends on how much water is changed. A 10% water change will not increase calcium that much, imo.
Here are some articles to read. Heavy reading at times, but will help you understand reef chemistry better:
Solving Calcium and Alkalinity Problems:
http://www.advancedaquarist.com/issues/nov2002/chem.htm
Magnesium in Reef Aquaria:
http://www.advancedaquarist.com/issues/oct2003/chem.htm
Reef Chemistry Calculator:
http://home.comcast.net/~jdieck1/chem_calc3.html