I'd say you're right to flush, I'd use a bit more water though at least double the pot size. You're having a salt retention/PH issue by the looks of it, causing lockouts. Your plants are displaying multiple deficiencies.. Are you using the directed amount of nutrients? the fox farm plants look a little bit nitrogen heavy, I'd take a less is more approach most plants don't need anywhere near the recommended dosages. I've always heard to light feed after a flush, like 1/4 strength. Since they will be hungry from being locked out, but you want to be careful not to cause worse damage in the delicate state so use a light hand. This can happen from not having some sort of lime in your soil, or from just plain ol'using too much nutrients too often. Try and dial it back to where the plants are happy but just getting enough, you don't want a bunch of fat ladies getting too much cake
Everything looks absolutely lovely as far as your grow room goes, you did a really good job.
This right here what you are dealing with is why I switched to organics, I was fighting this stuff constantly, nuteburn, PH issues, cal/mag issues, lockouts. It makes it way more challenging then I thought it needed to be, I can see how some find the "sciencey" approach fun though
I'm certainly envious of some of the hydro buds. I find the soil science is much more rewarding, just adding water and watching beautiful plants grow is awesome
