When is the proper time to use CO2? The mushroom co2 bag is what I am asking about. I see some grows that are large with no CO2 and some with. I see small 2x2 or 3x3 grows with and without CO2. I am probably looking to much into this, but before I drop like $50 on a bag of mushrooms, I would like to get a general idea. I stopped watching YouTube videos and I am focused on information from here. Thanks to anyone who replies. Enjoy your day.