YELLOW Curling Leaves mid Flower

It looks like this is the normal yellowing you will see when you decrease the nitrogen and your nutrients during the flower phase. The leafs are simply using up all the energy that is stored in them. You will see other leafs soon yellow and maybe even change to other colors like purple, and then fall off. The plants look great!

Completamente normal, vas por buen camino, sigue así

This is a normal behavior at the end of the flower period, i guess you are already started to flush right? The oldest leaves just start to fall of, but the rest is still nice and green, dont worry about nothing 👌😁 Please dont forget to mark my answer as solution if you think it helped you 👌😁

Super genial! El amarilleo es normal cuando bajas la cantidad de nitrógeno y en las ultimas semanas de floración cuando has realizado algún tipo de lavado de raíces o empiezas a bajar ppm. A tus plantas en mi opinión las veo super bien, veras como los cogollos en este punto empezaran a engordar y tal vez requieran en un futuro un poco mas de PK pero hasta ahora se ve super bien . Felicitaciones por tu primer cultivo! 👌