I set up 2 liter bottle of DIY CO2 about 10 days ago, mixed up 2 cups of
sugar, 1/4 tsp of yeast and a pinch of baking soda and filled the bottle
about 3/4 full. I initially had this hooked into a powerhead. It was
dispensing as I could see the puffs of gas coming out of the output. I
recently bought some Rena Micro bubblers to use rather than the power head
and now have the bottle with a fresh mix (last night) hooked into a 4"
bubbler in a 20g planted tank. My Ph in the tank remains at about 7.6. I can
see bubbles coming out of the bubbler but should the PH not change ?. Is the
tank not getting enough CO2, one would think in a 20g that one two liter
bottle would be enough, yes, no??

Thx.
Rick