Javalee,
What a gorgeous tank! You must be very pleased.
I think that some of the water calcium precipitates out (as calcium phosphate, calcium carbonate, etc). Scientists that analyzed filter biofilm contents found calcium phosphate and other precipitated salts in the filter gunk. Also, some precipitated calcium may end up in the substrate. None of this will hurt anything and probably will help.
In any case, the dosing you're doing is clearly working. |