I am setting up a 180 gallon low tec planted tank. As far as dosing goes i would like to know how do i dose K if there are already nitrates in the water from fish/bacterial load? I only intend doing 10% water changes monthly so Tom Barr's EI index goes put the window. I aim for 10ppm K.
Also what is the dose for direct dosing into the water. A stock solution is not feasible for 150 gallons water.

Very informative site.
LAKA