Flowering Plant leaves yellowing & some with dark leave edges.. What am I missing?

Hello! & thanks for helping me out.

In our 6th week flowering... Have had problems from 3rd-4th week of flowering. Leaves dying off & turning yellow. I feel like the plant is missing some vital micronutrients.

Anyone have any idea by looking at the plants?

First glance I would say its all normal, the yellowing of leaves during flowering, but I am going to go with my other feeling and say your lacking PHOSPHORUS due to the yellow leaves with a tinge of red in pic 4, Nitrogen levels are usually low during this time but yours appear really low, but im not familar with your strain or set up and this could be normal. My opinion is you have a Macro-nutrient issue, not micro....good luck