Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I agree with you that the K from other sources is plenty, no need to dose K as K2SO4 or other separate material.
It looks like you are dosing a lot of P, though. Usually the KH2PO4 is dosed at such a low level that the K is not significant. Most people do not want that much P in the tank. I think I remember the N:P ratio ought to be around 10:1.