I really don't know. I've worked with a balanced nutrient profile for over 15 years. The only real deficiency I've seen has been from the difference in magnesium needs between strains/phenotypes.
You may want to create an account on the forums at Icmag.com and post the picture up there. Lots of growers will be able to assist. :)
Thanks for the reply - this is the conclusion i have come to so far, i think i was giving the girl a water with 7.2 ph'd water, only testing it now, so i think it may have caused iron lock out due to high ph in the soil? So i flushed with 6.1 water yesterday and a light feed in two days, this may work i think.. but cheers for the replies and i'll head over there
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