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Science Project

My son is considering a science fair project using a DIY CO2 to compare
plant growth in parallel tanks with and without CO2.  Any suggestions as
to what sort of plant, substrate, fertilization etc. should be used
would be appreciated.   We are thinking elegans (elodea)

We have 7.2 Ph, hard well water.  Plan to buy couple of cheap 5 gals and
hang shop light across them, measure plant growth in millimeters/day.

BTW..we use 3 Liter instead of 2 liter bottles using the same 3/4 cup of
sugar recommended for the 2 liter size with water to fill bottle within
3" of top.  Comparing notes with other people using 2 Liter recipe, I
believe I am getting a lot faster gas generation rate.