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Here you can see how bubbly the tank is getting

A pH and KH measurement of the tank water is not at all accurate as a measure of CO2. Rarely will aquarium water not contain substances that affect the pH, and the pH/KH tables depend on nothing affecting the pH other than carbonates and CO2. You can measure the change in tank water pH with the CO2 on for an hour or so, vs with the CO2 off for 24 hours, and get a better estimate of how much CO2 you have, but all it gives you is the ratio between the ppm of CO2 with the CO2 on and the ppm of CO2 with the CO2 off, but not the absolute ppm of CO2.Drop checkers dont change for a bit, though shoudlve within 6 hours. First off, use pH to estimate CO2, since its much more accurate than that drop checker.