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Are you recording your temps? That dosent look much like heat stress to me, more like a nutrient deficiency .

That soil looks pretty intense. Did you buy it at a store? Honestly it looks like overwater to me, but you said you watered them when they started looking like that? Nothing you cant bounce back from.

Ok bro, it loks like you have mite problem. Go into your garden and pick 5 of the most damaged leafs and bring them into your house for some decent pictures. Usually the ones on the bottom of the plant are the most damaged. Then try analyze the under side of the leaf because that is where you...

Did the extra Mg fix your issue? I have similar issue. Check out my thread https://www.rollitup.org/t/sealed-room-with-gavitas-has-leafs-slightly-cupin.920365/#post-12941800

Bro im thinking something along these lines becasue I have some plants that are outdoor and are not having the issue.

Like honestly in veg that dosent matter. I have rocked 70%-90% humidity for years and have had plants thriving. I usually go by the VPD chart. During the day humidity is like 40-60 then jumps at night.

I thought about that, but wouldnt that be defeating the purpose of a sealed room? Ive heard something about that too maybe I should try to install an intake to turn on a couple mins every hour. Ive never tried to do it becasue mostly im scared of light leaks, and also im pretty sure sealed rooms...

They are gavitas and they are in a 12ft room so 11ft for sure. Canopy is about 4-5 feet from floor.

Temp varies between 73-82 Humidity seems to be between 50%-80%

Im using nutrifield coco+perlite mic. I hjave been using coco for about 4 years now and havent had any issues until I try to set up a sealed room with c02 and gavitas. I am aware of ph and salt build up issues so thats the first thing I check. Ive just started watering them everyday now to see...

Some more pics Honestly I have had them at 600w for a while now and turning them up slightly . I keepo running into this issue,. The last picture I posted was just of a small plant in my veg which is not sealed. My flower room starting drooping yesterday and has been bouncing back from a issue...

Just switched my whole setup to a sealed room with Gavitas and c02 and start running into this issue. I have some plant outdoor that its not happening too.

How funny, I have some similar issues in a sealed room with gavitas also. Mines look a little worse but I already see the taco starting on yours with the weird inner leaf. Hoprefully this gets figured out. My new stems look mad skinny too. What is your humidity at?

Nah your fine, but the plants in veg usually like it around 80-84 IMO. With some humidity to go with it.

50 is good. Normally you want between 60-40 in flower. If it gets higher than 60 i would try to figure something out, but if its a small grow im sure you can. Shit ive ran in the 90s and didnt get mold. more emphasis on air circulation.

What stage is the PM at and what stage are your plants at? Pics?

I dont know about organics because ive never done , but it really does look like N deff. Looks like anything about 7.0 locks out N. I dont know if that matters in organic thoooooo

http://bigbudsmag.com/wp-content/uploads/2015/03/marijuana-deep-water-culture1.jpg

Holy shit those roots look like they came from a tree from The Lord of the Rings. Focus on keeping your root zone happy and white first before trying to diagnose deficiencies. I dont know much about DWC because I only ran it once, but I know roots like that are not happy.

Just looks like a dud. In my experince they grow slower and produce less than the other plants it was cloned with. I would just take her out and train the plants around her to fill in the space. Perhaps a super crop and a fimm.