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I am looking at the CO2 scrubber idea and perhaps a T off the skimmer pump air line to allow outside air into the skimmer as possible, based on the pH desired/achieved. What is your preferred method of increasing the pH in the tank?
There are lots of good methods. Fresher air int he room, outside air to a skimmer, a scrubber, and growing macroalgae are all good.
I never had to use any additional methods as limewater/kalkwasser and an older home always kept my pH above 8.2, and before I got new storm windows, it was 8.3 to 8.55..