Don't Know Why

[Cbdman]

I dont know why my 2 Nightmare Og plants look yellow, I have 4 Liberty haze, and 5 animal cookie that look great like the other photo.
74 degrees + or - 2 degrees
2 CMH lights
18/6 Light schedule
reverse osmosis water
Drain to waste
feeding 2 time a day getting at least 30 % runoff
in coco
using Advanced Nutrients at 1/2 strength
added extra Calmag
4 weeks in veg
ph Good 5.8 to 6.1
I flushed , still no change
This time I added some straight well water to the mix ( 1 to 4) ratio ?? Seeing if this would make a difference. All the other plants look good. These 2 girls are being a pain in the ass. Got any Ideas boys and girls ?

 

[Pennywise]

It’s an immobile nutrient deficiency most likely Iron. Do you have a micro you can apply. Your ph looks good.

 

[Cbdman]

No micro, I was kinda possibly leaning that way, thats why I added the straight well water. I have high iron in my water, so hopefully this might work?

 

[Cbdman]

What gets me is the other 9 plants look good.

 

[Pennywise]

They all behave a little differently

 

[Cbdman]

Thanks Pennywise for the advice

 

[CagedApe]

You may want to stay away from RO. You are adding calcium but the RO water is stripping it at the same time. Good luck with the grow!

 

[Cbdman]

Ok I thought i would give a update, going to 50% well water 50% reverse osmosis Seemed to make a noticable difference in 1 day. Thanks for the info.