I suspect a potassium deficiency but I'm not that well versed with diagnosing nutrient issues in leaves. I can't see enough detail in your photo to see if that is mould or not. The veins of the leaf appear to be necrotic. Maybe someone with a better eye for these things can help more.Ok so I have a couple concerns with the purple haze and the leaves and I'm not sure what to do. Day 40 of flower, 52 of 12/12.
I found this weird white spot on the leaf, I was thinking the lights were causing the issue but it just looked weird to me. I'm not sure if it's mold or what.
I moved the light up the last 2" and hopefully that will give some relief they are about 8" away from the top of the colas. I also moved the fan back over to that side to help keep air movement on it. I'm thinking this one may finish first based on the trichomes on the colas. Do I pluck/cut dead leaves and or anything suspicious?