Lol, so the number one answer on here is still FLUSH FLUSH FLUSH!!!
No one asked a question, just FLUSH!
Fuck me!
Anyhow, feel free to flush, if you like to guess. Just remember. The last 2weeks is where 25% of the bud weight comes from, fuck that up and you are sitting on 3oz vs 4oz.
We nee more info about your water, TDS, and PH.
It looks like a micro-nute def. Micro nutes usually show up at the tops of the plant. Where macro-nute def's show up from the bottom and work upwards. This could be caused by lock-out, ph imbalance, etc...
I would only flush if you know the roots are healthy, and can drain/dryo out the medium quickly. The last thing u want now is rot spreading into the main stem...
Good luck.