The idea behind this experiment is to get folks thinking about such things.
To show that testing CO2 and O2 are important and have profound effects on growth.

Some cases will not lead the person to conclude this effect is real, but with good measurement tools, you can get a better comparison of these various tank differences and address such issues.

The goal is really to have a better understanding of CO2 and O2 production in our tanks and address many of these assumptions.
We must try these assumptions and see if they are reasonable

Without testing and thinking about it in this context, many will never see/learn more about it. Given it's critical role, that would not be wise.

I have the equipment and measurement methods available to do the work and test.

Most aquarist do not and remain, at least some, unconvinced.
I am trying to address methods that might allow them to test and rationalize it without buying DO meter and spending a lot of time measuring things.
There are trade offs with this less sophisticated method, but also some nice effects in the routine(lots of pearling).

Regards,
Tom Barr