Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I would continue treatment, then clear the tank of the medicine before expecting proper test results. However...
If your tap water has a higher KH, and the Aquasoil has been removing the carbonates for a while, it might be getting saturated with carbonates.
This is independent of the medication, might just be a coincidence. However, if after removing the medicine the tests remain the same over time (as the tank re-stabilizes over a week or two) then this could be a possible answer.