Nute def and the future loss of fan leaves help?

Too much grow or N coming into pre flower So to combat this from happening q good thing to do is cut grow before pre flower. (youll know when the plant starts stretch a lot more and will start throwing hairs out where the bracts are at V points "where the stems break off from the main node) As for the leafs. The main fan leaves can be removed. Once pre flower is over. Do this in stages 10-15% as not to stress/shock the plant too much. As for the damaged leafs. What lil bits are dam won't cause any real issues as its just a part. Now if leaves where hanging off or crippled id say yes. Remove them to allow other leaves take their place Just be careful with the nutrients Soil: 1-2 core NPK (Grow, bloom) feeds every 6-10days. Giving water or low ec nutes like stims, or an enzyme Coco: feeds every day, with follow up water feeds. Or feed, water feed, water (again the water feeds can be a stim to low EC feeds like calmag) be sure to flush hard every wk and test run off. Good luck

Senescence represents the final developmental act of the leaf, during which the leaf cell is dismantled in a coordinated manner to remobilize nutrients and to secure reproductive success. The process of senescence provides the plant with phenotypic plasticity to help it adapt to adverse environmental conditions. Let the plant defoliate on its own. Watch and learn then expedite the process yourself. Any leaf taken off by hand that is still green. Let the plant remobilize nutrie within the leaf first.

It's nothing to really worry about, maybe a bit of ph imbalance in your grow medium. Try lowering ph to 6.2-6.5 more nutrition will become available.