How does co2 building up at night harm the plants? I've noticed that I can see peaks at night of 1600-2500 ppm, I've noticed that after a nice drench of a Tea, the co2 levels seemed to peak and I've always attributed that to the soil doing it's thing, and/or being healthy.
In my veg room, I run it sealed, no air in no air out and I don't supplement with co2 either, and it doesn't skip a beat. Pond liner floor and kilz primer with paint on top. I have a co2 monitor in the room just to check levels and it seems to hover at 400-600, and when I work in the room, it can peak at 1500+.
I've never vented any of my sealed rooms at night and I run co2 tanks. Now I have had major problems with propane burners and
not burning properly.
I'm very curious about this and the importance of venting at night, even if it's just for a little while.