need some advise (pic)

i think i am having problems with p?

Fox farm
outdoors
was using roots organic when spots started, switched to pureblend and helped alot but still slowly moving up

can I see the underside of the leaf?

here you go

To me it looks looks a sulferic acid burn. Did you have vog, then a light rain recently? Do all the plants have those spots? What really leads me to that conclusion is the last pic. water pools at the leaf tips, and that is where it looks worst.

This is just a wild assed guess.

i live on the hilo side and i have not noticed any bad Vog but that could have something to do with it because after a hard rain the browning started to happen, but i think the spots may be something different