No CO2 i gave up on it when my burners broke. Vegging til about 1 ft high. Im in hydro 4x8 canadian table and 6x6 pots of hydroton. Ionic Nutes with bushmaster and boost. White Rhino. I havent been able to break the 0.5g/w barrier. Maybe CO2 would help? Maybe going to soil?I'm in soil as well------You're getting just a hair over .5 grams per watt which is good but not great---are u running co2?---how long are u vegging your clones? What is the nutes you are using?-------------My goal is 1 gram per watt-My last run was just under 1.15----the strain is "godzilla"--I veg the clones for three weeks then snap the light cycle. If you need help to get those numbers up, let me know.