Can anyone tell me what is happening to my plant?

Im growing two strains one orange cookie and critical purple kush.
They are in 20 days flowering.

Orange cookie.
Its very dense and growing very good untill i found half of the plant is dying and rest is growing without any problem.

Critical purple kush.
It was growing like anything but something is not right with it frm last 4 days.
All leafs are curling down and it looks like its dying.and dying.

Im attaching images please help me out.
 

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They are really purple. Maybe post some pics with normal lighting when you get a chance.
What medium are you growing in. To me they look wet.
 
Im growing them in cocopeat and i water it 3 days a ago and medium is also bit dry now so i dont find any issues of overwatering.
So fucking confused
 
Coco coir and peat moss mixed together? Coco needs to be wet all the time and peat needs to dry out. Kind of two different things going on there.
Wait for some other people, I'm still killing my 2nd plant. It's in coco/pearlite. I do grow actual vegetables in peat soil, really like it, easier than coco.
 
Yeah even i think that might be nitrogen toxicity.

And also in my orange cookie out of 10 tops(cola) 4 are dying and restt are growing good. No issue with light.
all getting equal amount of light.

can you tell me what is issue cz only some parts of plant is dying.
 
Yeah even i think that might be nitrogen toxicity.

And also in my orange cookie out of 10 tops(cola) 4 are dying and restt are growing good. No issue with light.
all getting equal amount of light.

can you tell me what is issue cz only some parts of plant is dying.
Post pics in normal light if you actually want comments other than WOW that is purple
 
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