Looks more light an advanced case of heat stress to me. How high above the canopy do you have your lights?
It seems to be happening to the top-most leaves, so yea, I'd raise the lights up a few inches and see if that helps.
Are they all the same strain? Have you checked the affected leaves of that one plant for pests? What medium are you using? Could also be root/pH issues. Try one fix at a time though. Raise the lights or lower the watts first and see if that helps.
Its nute burn I have to get away from this fox farm trio, you have any suggestions on what line up i can go for, for next grow
Were you using Fox Farm soil to begin with as well? If so, when did you start adding the trio and how much of it did you add? I've known growers who used Fox Farm soil, then when the soil ran out of nutes (around after 2 months or so) they slowly added the trio in small doses at first then increased as the plants got bigger. So it also depends on what soil you used, when did you start adding the trio and how much.
Added grow big on like week 2 of seedlings then big bloom once started showing pistils pretty good and feed once per week about a gallon they are in 3 gallon pots 2 tsp of tiger bloom and 3 tsp of big bloom i push them
