To be honest, the CO2 bottle is for my Jeep’s lockers. I don’t really plan to add CO2 at this time. I bought the monitor to monitor it and they seem to be doing quite well without it. I’ve been trying to dial my environment and VPD now that I have the Pulse grow monitor in there.
Previously my room was also “sealed” too, in that I’ve never vented to the outside. However, then I added insulation, texture, and paint the room is much tighter than it was previously. I also had a 3" gap under the door. I used to run my humidifier 24/7 and never go above 50% RH.
Of course I have a whole lot more plants than I did before as well. I had 18.5 ft² and now I have 40 ft². Not to mention the height, 55.25 ft³ vs 300 ft³!
Did I mention I’ve never grown plants this big?