The way the leaves look is slight-n 90% is ph usually how to know the fan leaves make plant look like umbrella.
Some strains turn red I have tried it all one pot and only one transplant, measure ph 3times a day, Foliar sprays.
The best results is to fight it before it happens I have use a foliar spray I got from seamaiden. 5:1 personal mix buy the cal and the mag and mix your self. I have seaweed power and soak in ro water. I mix this together with some rizotonic. (early on). Spray twice a week. Now all that said 3 or 4 th week of flower red stems. Not every time.
If you grow any thing White strain or if it has greater than 50% white up your Cal double and add to reservoir besides the sprays.
I believe that the stems have something to do with the P but have no data hunch.
I used to think it was the indoor growing changing what the plant that was made for by god.
We no longer have much in common with what Ranger One gave us.
They have messed with all of it, how tall, auto flower, Feminized, Taste, shape, and then the chemistry.
I am old and have smoked from the 1960's. THEY HAVE NOT HELPED just made it a billion dollar business.
When it gets legal most every where. Then the real GMO want to be gods will really screw it up.