Ca (?) deficiency

It's a nut burn, not potassium, calcium, or magnesium because ur leave are clean and dark green if you had these 3 your leaves be yellow with dots and curve up with crispy tips and edges so lowering EC by 0,2 till is time to use flawless finisher is perfect btw make sure water is not more then 150 ppm 0,2 EC while u flush

Throw some epsom salt in too for your magnesium

Potassium and magnesium deficiency. Hit with some beastie blooms no nitro 🤙🏻

You want to harvest in 2 weeks already. Then you actually don't need to do anything else. I wouldn't plan the harvest in advance and would wait for the condition of the plant. In that case, more Bloom would be appropriate, and maybe then in week 10 as planned, if it's ready by then. 😎

Das ist Kalium Mangel. Die nekrotischen Flecken hinter den Blattspitzen verraten das. Dünge mit 30-50% mehr Bloom. Ist noch nicht schlimm aber du solltest jetzt was unternehmen. Viel Spaß mit der Ernte. 💪😎

At first glance I want to say it is light burn but I can't tell from the pics if this is happening on lower leaves or just the ones closer to the light. It also just looks like she is just starting her natural fade. I guess if this was my plant, I wouldn't worry too much since you are so close to harvest. I would want to start seeing a fade at this point.

Seems like call Mag Def. Magnesium def, more than cal. In my Op. Some of my OGs had this problem on Veg.