https://www.plantedtank.net/forums/...s-cycling-buffering-substrate-0kh-low-ph.htmlRaising KH in an aqua soil tank is generally something you don't want to do. The soil itself is designed to keep a low to zero KH. I see adding carbonates to a soil tank like adding a humidifier to a room you've installed a dehumidifier in. Aqua soils have a finite lifespan that is accelerated by how much carbonates they have to absorb, which is why most of us using it use RO water with only GH boosted. Add to that, the bacteria you are trying to colonize adapt to water parameters just like fish do. It's my understanding that you want to culture these in the water parameters the tank will ultimately have, as @Econde said. Probably no harm in what you've done, but I would let the soil do its job and drop it back down. You can only rush cycling a tank so much and by changing the parameters and then changing them back, it's probably only serving to make your cycle take longer.
Searches on this forum have discussed using tap water (which raises KH) to start the colony of bacteria, and then switching to remineralized distilled water when the colony has been established. I understand your concerns about expending the buffering capacity of the substrate, however other hobbyists have claimed the period of time spent cycling won't expend the capacity. If you have had a different experience regarding this please let me know.
My original question was not concerned with whether or not my buffering capacity would be reduced. I am asking about whether or not I should be adjusting my CO2 input due to the change in my drop checker.