Measureing CO2 in the tank will be an inaccurate way of measuring the
production. Depending on how fast the plants are consuming it, you'll get
fluctuations etc. Can't use a bubble count to measure it either,
since, like you mentioned, its diluted with air.
What probably needs to be done, is to setup two identical bare tanks,
with big reactors that will dissolve everything. Set one up with identical
yeast bottles, with one having the air input. And then at fixxed intervals
check the dissolved CO2 levels.

"Brian C. Attwood" wrote in message
...
Joey wrote:
I made a modification of my DIY yeast+sugar system. I have an air tube
bubbling air from air pump into the close yeast+sugar+water+baking
sodas solution.

One problem I see with this setup is that the air is going to dilute the
CO2 going to your powerhead. If you are diluting the CO2 going into
your powerhead then most likely less CO2 will dissolve into the tank.
You might want to monitor your CO2 levels in your tank as part of this
experiment as well.

Brian