Confused about yellowing

Hey All, Ive read my brains out and thought Id post pics
-sativa strains, blue dream, cookies
-20 gal pots outside org soil
-water every 3 days til runoff, don't think I'm over or under, do it carefully
-veg was fox farm grow big, every other watering
-twice in the 2 months of veg a little bat/seabird tea
-into bud fox farm big bloom and a quarter dose of grow big

lots of yellowing, and some purple edges lots of die off

Mostly concerned with the leaf close ups, it is ion the earliest stage of flower, like 2-3 weeks and this coloration is all over in beginning stages

any thoughts? and thank you

That happened to all my plants as they began budding. I wouldn't worry about it at this point if it's only the bigger/ older leaves.

Do you have any bugs in your soil after watering?

Nada on bugs and great ph in water and runoff im thinking nutrient OD

Nice. Do you use RO water or tap.
I use tap water with heavy chlorine. I have to let it evaporate for 2 daus rather then 1. By the way I am not trying to be negative just trying to see if I can help.

My best guess from looking on line is excess chlorine or iron. Sorry I am not that well versed in the plant problems yet. Still studying and growing. I figure I'll learn from both lol.

I think your plant is behaving normally and utilizing stored nutrients in the leaves