ok, how much does c02 increase your yields? does it tighten up your buds dramitically?i have a space of 4x4x8 with 7 plants going under a 600watt hps. iwas thinking of purchasing a c02 boost bucket . would it be worth it?? my temps are running between 78-82. im vegiing now and would like two veg until there about 2ft tall. what could my temps run at with the c02 boost on? and when is it best to apply co2? right when you start flowering or when you are a few weeks into flowering??