The pH fluctuations caused by CO2 aren't the kind that affects your fish (rather, the dissolved gas concentrations in the water affect the fish, so CO2 does have an impact, but not due to pH swings). pH swings caused by hardness fluctation is what affects fish. So don't worry about regulating pH, and instead focus on attaining proper CO2 that is good for your fish and good for your plants.
I prefer to run high CO2 with high amounts of water ripples at surface from filter output. Might cost a few pennies per day in CO2 to agitate the surface this much, as my bubble count needs to be high, but it's still very cheap.
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Eheim Pimp Club - Member 468 (2217)