I'm pretty much an R/O type due to extreme tap harness and chemicals,but...If I had your tap parameters, I'd sell my R/O!...I'm not quite sure why you want to change anything...Discus should breed fine in your tap...Back to q's, I have never used the two products mentioned, as I use my tap to add minerals back to my R/O..sometimes use Kent Discus Essentials, but prefer the tap/ R/O waste reject...