This is my third attempt and i'm having no end of apparent Ph problems. I cannot get it right. I'm using Nutrifield for grow and flower, which I used last time, but the first crop I used a different nutrient and had the same problems, so to me it points to something else in the environment. I got these cuttings from a mate interstate who uses the same nutrients, same ph levels etc and he has no problems, yet within a week I start getting yellow patches, dried edges, twisted/gnarled leaves, "fluffy" look to leaves, 3-prong leaves, etc. Last crop I experimented with the Ph a little and found I have to keep it between 5.8-6.0, anything else and I start getting problems, but I still get problems regardless.
I'm using nutrifield premium coco, a 600w light, centrifugal fan and oscilating fan (plenty of air movment). I got them with 7 prong leaves, but within a week they were shooting off 3 prongers and started developing the problems you can see in the pictures.
Is it normal for plants to be so sensitive to Ph?
What else could be causing these problems?
What do I do? I am at my wits end, to me it doesn't seem that anything other than Ph could be the problem because i'm using good quality nutrients that someone else I know is using without problems, yet I can't fix it by adjusting the Ph.
Thanks for your help...