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Sure looks like Potassium deficiency.

Thanks Terry, I'll keep them on schedule and see what happens. BTW, all you guys are awesome. Thanks for the speedy responses!

My idea what that the mother from these two clones was infected (got them at a nursery). I didn't see any damage a few days after spraying the Mighty Wash, so I really doubt that its physical burn.

I hope not. Any idea what would cause such rapid necrosis?

Tobacco Mosaic Virus. Just heard about it today

I believe it started after, but I can't be certain now. I sprayed them because I saw the beginnings of mite damage on one of them. I definitely sprayed them right before lights off, I guess there's a chance the timer malfunctioned. But again, I did the same thing with the other 3 plants and they...

Leaves are crumbling to the touch. Upward tip deformation. Does TMV move this fast?

Some of the leaves are shiny, but it rubs off. I believe its just residual from the Mighty Wash. I honest think the Headband clones I was sold has TMV. This looks like the characteristics, especially since its just one of the strains. Do I gotta toss these plants?

Nothing, just straight RO water

I have no idea what is going on here, leaves are very crunchy and dying rapidly. It is only affecting 2/5 plants, but both are the same strain (Headband). I'm in 3rd week of veg, plants are in FFOF, and watering with pure RO. The two other strains I'm growing are doing fine. 3.5'x3.5x' tent...