I wouldn't worry too much.
I don't mean to constantly be that guy, but I think you're jumping the gun with co2. It's not a financial waste like those shitty mushroom bags, but until you have got your means and methods nearly perfected, the right equipment to monitor VPD, PAR, ambient co2, and a sealed environment, it's not going to do a whole lot. Co2 allows the plant to photosynthesis more and uptake a higher nutrient regimine. Without an innate understanding of what the right light level is and how much/often your plant eats, pushing variables is going to give you more questions than answers.