Now 21 days of bs with bottles seems doable!?!? 
I used those yeast co2 packet kits. It’s kinda cool as the temp to keep CO2 yeast active fits into the elevated temps allowed by using CO2 so win win. If it got too low, yeast stalled = no CO2 bubbles. When I had 4plts working I put a 6in below the plants like in the undercarriage, with the co2 tube above it. The buds were harder than normal, i was running @1200 (now that I know the ppfd at the height I had the light). I loved it but the temp/yeast stall made me dump that idea.
I used those yeast co2 packet kits. It’s kinda cool as the temp to keep CO2 yeast active fits into the elevated temps allowed by using CO2 so win win. If it got too low, yeast stalled = no CO2 bubbles. When I had 4plts working I put a 6in below the plants like in the undercarriage, with the co2 tube above it. The buds were harder than normal, i was running @1200 (now that I know the ppfd at the height I had the light). I loved it but the temp/yeast stall made me dump that idea.
.
