Hi Vaughn,

ok the KH is good. What about the PH at 8.0? leave it alone? Do the plants care?
Peat will introduce tannins. Will that will affect PH and KH readings?

I also have a non co2-non Excel tank which has a dusting of peat in the sub and yes it has yellow water. KH reads >1. Are tannins interfering with KH reading(tritration method) If so then what?

I have searched Tannins in the forums. Sounds like there is interference. Mabey AC will help but isn't the yellowing supposed to go away after awhile? Then is that the end of the acidic affects?

I thought that KH should be watched- or a I making to much of this

Chris