Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Dolomite has a strong action.
I dusted perhaps a tablespoon of dolomite sand on the bottom of a 29 gallon tank, and used Soil Master Select (a montmorillonite clay) substrate that removes the carbonate from the water.
Well, the dolomite is adding minerals to the water. GH is higher than the tap, KH is stable (not dropping- I think the SMS is taking it from the water and the dolomite is giving it to the water). TDS is higher in this tank than any of the others.
Next time: Add it to the filter in a nylon stocking, dose or remove as needed!