[Beverly]

Test your alkalinity, calcium and magnesium levels.

Articles on these subjects:

Solving Calcium and Alkalinity Problems:

http://www.advancedaquarist.com/issues/nov2002/chem.htm

Magnesium:

http://www.advancedaquarist.com/issues/oct2003/chem.htm

The Reef Chemistry Calculator:

http://home.comcast.net/~jdieck1/chem_calc3.html

Aquarium System Volume Calculator:

http://home.comcast.net/~jdieck1/volcalc.html