I am a soil grower. I use Superthrive, Pure Blend Grow and Alaskan Fish Ferts for veg; and Pure Blend Bloom, Fox Farm Bloom, Earth Juice Bloom, and Awesome Blossom for flowering.
Flowering room painted white is about 7' tall; 2.5' wide and 3' deep. I flower with an air-cooled 400w HPS with a 265cfm Dayton blower; and exhausted into my garage where it is then exhausted to the outside. I manually turn on the CO2 tank (once at lights on and once before lights off) and distribute about 25 seconds of CO2 to flowering plants through a 1" hose that has been inserted into the grow room from a hole at the top (tank on the outside). I use no CO2 during veg.