Completely stumped, research has led to Tobbaco Mosaic virus but it just seems so unlikely

This showed up on all 4 plants about 3 days ago, just 2 days after changing the light schedual to flower.

This entire run has been trouble from the start, very slow veg and a scare of what I thought was broad mites, still dont know what that was (leaf folding ect...) they eventually got going and have been pretty healthy, still are looking OK except this.

4 plants, 3 different strains 75-77 temp, 40% humidity. Same exact enviorment, lights and all from last run, even 2 of the same stock of seed.

Fox Farm Ocean Forrest, got its first dose of bloom nutrients about 5 days ago. RO water with cal mag PHd to 6.5-6.7

Completely stumped.

When you changed to flowering did you adjusted the light height or intensity?

Star Dog said:

When you changed to flowering did you adjusted the light height or intensity?

Click to expand...

No

I see early potassium deficiency showing. I don’t see anything else except possible twisting of new growth. You’ve checked for bugs?

First set of bloom nutrients?

one of my plants is exactly like yours. The leaves where that's happening were the ones closest to the light, which was far too close to them for a couple of days as I forgot to move the light. Moving the light did the trick and other leaves didn't get the discolouration. Plant is doing ok regardless and the discoloured leaves look healthy apart from the apparent cosmetic bleaching.

I'll take that's happening to the upper leaves?