This is super interesting and absolutely worth knowing. With that said - I did run a drop checker for weeks confirming my level, I also found my PH to be pretty constant a day or so after my water change (when not using injection). I guess I could also tune my apex to compensate for it as well...either way it's good to know this info. I just worry about NOT using a PH controller and not putting in enough CO2 - as it seems maxing CO2 is a major weapon against algae issues.Now imagine you have a ph controller taking care of your CO2 dosing. You check your degassed ph on Monday, and you see 7.2. You set your ph controller to shut off at 6.2. By Saturday, your degassed ph is 7.7, but your controller is still pushing CO2 to 6.2. That's a pretty big drop, and will definitely start gassing fish.