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Double check the pH probe - as a first solution (IMO). Then see if your CO2 scrubber is somehow making a problem.Maybe, but a two week lag time to see the effect of the change? It's also hard to explain the change in alkalinity consumption without the corresponding drop in pH being real, I'll double check though.
I haven't cleaned out large amounts of algae, nothing any different than is typical for me.
PS im perfectly happy with a pH between 7.8 and 8.2. You may be trying to solve a problem that is not a problem