Persistent markings spreading on leaves

Ahhh okay :) Yes you are correct my friend sorry they do say assumption is the mother of all fuck ups i just seen the medium and automatically assumed it was soil sorry for that. Well your right up my street then boss let me introduce myself i am UK420show haha I am a hydroponic dwc grower have been for the past 2 or so years before that I was doing NFT technique so hydro is my speciality right lets break this down then so you fed her cal mag and your ph is perfect. Thats ruling alot of things out right in my dwc if my pumps turn off or my lines get blocked and there is less oxygen getting to the roots as there should be I can get brown spots on my leaves too. my only other guess would be this is some kind of root problem there are no burnt tips or are there much signs of fading that ppm is quite low so it could simply be a macro nutrient defieancy like iron or boron. Have you fed her any pottasium yet ? Pottasium stimulates root growth and promotes good beneficial bactira growth which is vital in keeping a plant topped up with all its macro nutrients :) Thanks for replying and giving me the feedback sorry I answered incorrectly at the start. Best of luck for a happy and heaty harvest :)