^^^Desertboy you are on point.
Buddy Hemphill, Im having the exact problems you had and its driving me nuts. I finally unsealed my room and within 4 or 5 days my pllants made a dramatic change for the better. I dont know why i waited so long..
Are you any closer to figuring out why plants need this fresh air?
One thing i have noticed is when my plants get bigger ( i do OG bushes) and my room gets filled in the problem starts fixing itself. Maybe the small plants im taking from the veg room are not big enough to produce enough oxygen to keep their new sealed room balanced.
THANK YOU so much for starting and keeping this thread updated. So far this is the most promising solution to my problem ive found yet. The other option is to completely unseal my room, but that is unacceptable because of summer heat and the fact that i refuse to throw in the towel and let my expensive as hell excel air A/C collect dust in the corner. Your method allows me to keep my co2 and AC setup.
Once the run im on is finished, im going to do a run with room purges on your schedule (or maybe 10 minutes every 2hours). If my plants get back to perfection im going to write "Buddy Hemphill is a genius" on my
panda film in sharpie. not kidding.