Top of the plant leaves turning yellow

Needs more nitrogen, usually feeding schedules require 1/4 or 1/3 veg feed added with your 3/4 or 2/3 bloom feed.
 
Dude, that looks like a cal/mag def. See how the leaves looked striped? What are u growing in? I would flush, then add a low dose of nutes with some cal/mag.
 
im growing in fox farm ocean forrest potting soil and ive been feeding her low doses of big bloom and i just picked up some grow big , and from what ive heard i should give it 1/3 grow big and 2/3 big bloom.. do u think thatd help??
 
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