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The second reading is your Calcium level. It should be between 420 and 500. Below that---your snails' shells start dissolving. And your fish's bone and muscle suffer.
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Sk8r, Natural sea water calcium concentration is between 380ppm and 420ppm depending on who you're reading ... I had no idea that my snails and fish were at risk through keeping my calcium levels in the range 400-450ppm. Do you have a source for these claims, please ? Randy "suggest[s] that aquarists maintain a calcium level between about 380 and 450 ppm." [source: http://reefkeeping.com/issues/2007-04/rhf/index.php ]
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These are my Principles ... If you don't like them, I have others -- Graucho Marx
http://www.reefcentral.com/forums/showthread.php?t=1650727
Current Tank Info: 500 gal reef
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