Ruben, your calcium level is not so far out of the norm that you need worry. As a matter of fact, depending what you just did to your tank, ie water change, top off, supplement, etc will efect your calcium level. Did you know that the amount of co2 in the room of your aquarium drives your pH which effects the Ca and Alk readings. Anyway, I don't know what scale you are measuring Alk with, dKH, meq/L, or ppm CaCo3, but here is a conversion chart so we can all be on the same page;
http://ozreef.org/content/view/5/2/ . now here is a site that is a little in depth, but it will help you immensely if you look at the chart provided of Ca vs. Alk, determine which area you fall in, and follow the instructions on how to correct your situation.
http://www.advancedaquarist.com/issues/nov2002/chem.htm I don't know what you have in your tank, but you are not in a drastic situation, so relax, and read this site. I hope this helps you and others.
Chris
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90g AGmegaflow, 30g Sump/refug, mag18 recirc, 2 mag 5's in tank JBJ235Watt PC Turboflotor1000 150LR 100LS 17corals Clown,Lawnmower Blenny, Chromis, Anthia, 3 emerald, 1 electric blueleg,3 scarlet crabs.
http://www.3reef.com/uploads/Chris1.jpg &&&&Another Great SIG By NAUTILUS
