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1.9% of magnesium in Mega crop so might be that. Culd be due to a lacl of mag or a bad ph that is locking the mag so check the ph runoff. With 1.5 ec in hydro at this stage it can't be a nutrients burn ( my plants are in coco with 1.8 after 5 weeks with no burns , ni brown tips.

Hello there! Sometimes it is a mixture of things responsible, lower leaves looks like she is hungry but it could be light bleaching. Did you spray something on her like water? The top leaves lighter green colour spots looks like leaves bleaching due to the strong light reacting with water or ferts. I would push her aside from under direct light hit, or pull up those light higher and give her a light feed with lots of Epsom salt, time will do the rest. Do not worry they still continue on producing flowers even when leaves are damaged, I have seen some diaries where they defoliate so much yet produce a lot!😉

@grofreq Hi mate your plant is showing two deficiencies that I can see one is magnesium with the slight leaf yellowing along the edges second is calcium with the rust like spotting Simply feed with a calcium magnesium supplement Good luck