My kH issue is semi resolved with eh crushed coral in a baggie...it stays around 60ppm now which allows me to really pump the co2 in and maintains a ph around 7...it was more of how much co2 can i pump in safely, once I get my drop checker setup right I think I will just use that
My KH here is 20ppm or less sometimes, I have never messed with it in about 6 years now. There is NO NEED to make it harder unless you have some fish that require high KH, eg some wild caught Tropheus or something.
You have great water due to the location you live.
So your KH is a tad over 0.5 degree, you STILL have some buffering capacity.
It's only when you get to zero that the pH/KH chart does not apply. Know nothings rattle on about this, but I've never had a case or seen one I was certain about where the pH dropped and they gassed their fish, in fact, I would challenge such claims as baloney.
If the CO2 gas rate being added is stable and the same, the CO2 gas in solution should also be relatively the same regardless of other issues. Now, without any KH, the slope for the CO2/pH/KH relationship falls apart, so you cannot measure the CO2 with that method..........but the CO2 being added and present for the plants........however, should be the same or close.
In otherwords, I can add 18 ppm of KH to RO/DI water, add CO2 to say 50ppm, then replace the water with pure RO/DI, the CO2 rate has not changed. So we shoul be pretty close to 50ppm, the only issue is now I cannot measure it using the KH/pH relationship.
This same method can be used to measure other factors that influence pH, eg tannns in your water, other forms of alkalinity(hydroxides, NH4, PO4, borates etc any non carbonate). Then after the flushing, you can return back to your standard routine.
Do not assume anything about CO2 as far as what is optimal, some might suggest 30ppm, but other tanks might need 50ppm, another might do best at 60ppm etc.
This assumption is the one of the worse, 30ppm is not a bad place to start, but then some tweaking from there is wise. But NEVER assume because a drop checker says around 30ppm, that everything is perfect. It's not, and this is an assumption as well.