Is there any need to purge CO2 in a sealed room?

[growshopfrank]

i am having adverese effects and i beleive its from high co2 levels at night,lights on co2 is set at 1200,lights out four hours after going dark the levels are at 1900,yep shes sealed tighter then a bulls ass in fly time,but i am getting lower leave damage,resembles magnesium diff,lowers go yellow,tips curl up and then brown off,slowly spreading to high leaves,im thinking either i add ozone at night with a controller to keep it around 0.1 ppm as safe with wcb regs or to vent periodically at night,any feed back guys?

I had the same problem
beautiful cuts then after about a week lower shade leafs start showing what looks like mag deficiency it would start slow then progress quickly eventually stunting most of the plants
never happened during vegging in the room only flowering

after trying just about everything tracked it down to humidity

on an 18 hour cycle the AC would keep the humidity in check
on a 12 and 12 the humidity would spike to high 70's at night just enough to make the plants sick

I put in a big dehumidifier set the max humidity at 50 percent and bang the room produces as it should

sealed rooms are the way to go but they can make a grower crazy at times...

 

[shuswap]

humidity is around 65-70 first week then 60 till week 4 where it drops to 50 no problems there,i have just added a intake and exhaust,just 6 inch but gonna start with one minute an hour and watch the co2 level periodically thru the night.the burner isnt leaking natural gas and the flame is as blue as would want,im thinking the oversized burner in the room might just be taking to much 02 out of the room and perhaps just needing a purge,heres hoping it helps!