Grooven, I have 3 2L bottles with the same mix in my room... The tubes just hang over the plants, CO2 just falls onto them when the fan turns off at night...
I put the bottles in about 2 weeks ago and since then, the buds have gotten rock hard and swelled. I don't know if that's just what stage of maturity they are or if the CO2 had something to do with it. All I know is the plants aren't reacting negatively to the setup...
I dont think it would be worth it to attach some sort of enviro controller to regulate the output... If your looking for something that tech, get the tanks.
If you can stand the bootleg nature of the homemade tanks, give 'em a try...
