Plants with yellowing and purpling of the leaves.

I have 4 plants, Sour Diesel and Durban Poison, and they are getting some purple and yellow on the leaves. They are in coco/perlite, gh 3 part with some cal mag, HLG 650 light at 36” 80% with some side lighting as well. Res is 27 gallon, kept at 5.8-6.2 ph, temps lowering and lows at 65, highs at 73. I have a couple fans going, the purple is mainly where the fan is making me thing it is temp related, just looking for confirmed answers. Here’s a few pics. Most of the leaves are fine, there’s only a few that are discolored. Buds are looking fine still, pics are the first two

Everything looks good from what I see, usually closer to harvest leaves will die off. Plants look close to being done.

Looks like a normal late flower fade.

I have a Durban poison starting to do the same thing. Mine is from Nukeheads. How about yours?

Thanks for the replies, I was figuring normal yellowing but wanted to be sure.

You might turn up the big light or lower it as the plants would like 80* or more under LEDs, lots of white pistils still, a week or more away for my likes. Nice buds of normal color variations.

I also have this purplish between veins,some would say P deficiency.If it starts at the middle and works its way out to the tips then could be a deficiency.Im also noticing its more so the top leaves so perhaps its the light.

Plants look good,dont think Id worry too much.