Hi again guys,

@ Snakeskin, thanks for the advice but I always have good circulation/ventilation which is displayed in the unbelievably thick stalks!

@ Everyone else, thanks again and the problem seems to be subsiding and I'm almost 100% certain it was the PH.

It turns out my lack of practice caused this and I had the PH monitoring all wrong as I didn't even take into consideration what the nutes would do to my naturally 8.0ish tapwater.
It turns out that they bring my tapwater down all the way to just under 6.0 which is exactly where I need it, so all that PH down I added was making my solution very acidic, I dread to think exactly how bad it was in numbers.
But the plants ae generally thriving and a little leaf curl didn't seem to effect their general wellbeing.

Today they went into Flower and as its Jack Herer I am expecting upto a 12 week wait before I'm smoking something good again.
I wonder how many females I'm going to get! :smokin: