I ran planted on all 3 of my FW tanks before deciding to make the change-over this last fall. I never found anything or any reading that showed a relationship between CO2 and KH.
KH affects pH for a short while after a dose, and CO2 affects pH, but that's all I can tell ya, besides the fact that I've never seen anything on pH swings changing KH.
Hopefully others will either back me up or show some info to dispute my learnings.
Sorry I can't help ya with the KH discrepancy.
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