No the change in pH is not real..It is just a reaction to the gas and physically changes the water not one little bit.
In all other case [beside injecting Co2
] changing pH 1 degree can be dangerous.
Do you use a drop checker to ball park CO2
If not do you test your kH
to ballpark from a chart?
How did you come up with the setting you use?
I let my tank run without CO2
and then set controller 1 degree lower.I turned on [timer] CO@ 1 hour before lights [so it would be available when lights came on] and shut it off 1 hour before lights so it would be used up.