In the Nov issue of "Advance Aquarists Online" there is an article about the relationship between Calcium and Alkinity. It was a very interesting read so I possted it here for others to reference and make comment ofcourse.
CHEMISTRY AND THE AQUARIUM by RANDY HOLMES-FARLEY
Solving Calcium and Alkalinity Problems
http://www.advancedaquarist.com/issues/nov2002/chem.htm
CHEMISTRY AND THE AQUARIUM by RANDY HOLMES-FARLEY
Solving Calcium and Alkalinity Problems
http://www.advancedaquarist.com/issues/nov2002/chem.htm