Ca ppt
Sounds to me like your Alk is not high enough to buffer the pH enough to prevent the ppt of calcium carbonate. You may be getting severe pH swings during the day/night cycle also.
Try the Randy Holmes-Farley articles on Alk,Calcium and pH in the Advanced Aquarist archives for strategies and explanations.
IMHO raising your Alk. with eg. baking soda would be where I would start.
Good Luck
__________________
John
its all about quality, not quantity.....
...when in doubt buy a Binford....
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