Humidity problem with rockwool blocks in sealed environment?

[SamandMax]

I switched to external air without the supplemental CO2. Unfortunately some complication occured.

After removing CO2 and lowering temps (switching to external air) - plants sick?

Because the room was getting way to hot with all the lights on and no aircon, I had to switch to external air. I switched two days after I started flowering cycle. Plants are now 5 days into flowering light cycle. Its ebb and flow, rockwool, SOG. I think the temperature switch was pretty extreme. A difference of about 15 degree celsius and co2 difference of 1000ppm. Pretty much the day after switching to external air some plants are looking really sick and nearly all show more or less sings of …

[ShiskaberrySavior]

Not able to see your plants, I’d try to maybe give them a spray with humic acid which should help with nutrient uptake and increase humidity a few hrs before lights on!

It is somewhat normal to see a nitrogen shortage in the stretch period but at 5 days shouldn’t be that noticeable yet , maybe the huge difference from where they were to now is what your seeing ie tropical jungle to desert!

[SamandMax]

Its a nitrogen shortage maybe? Could you answer in the other thread pls. Thank you very much. Can you see the pictures?

[Schmokey]

I’m leaning towards nutrient solution and/or ph out of whack.