indoor. fox farm ocean forest soil. Roots organic nutrient line.4th week of bloom.He means boron or molybdenum and I doubt that is the issue. It's pretty rare as well and would affect newer growth first.
Some more info would be helpful. Indoor/outdoor, feeding soil mix etc.
How old is the plant?
Almost looks like nute burn with the turned up, burnt leaf edges. If you haven't been feeding her much what do you have in the way of ferts?
It does kind of look like molybdenum deficiency, but I would guess potassium personally.
We are going to need some detailed information about your grow to be able to help you figure out how to fix it.
420 Magazine ®
This link goes over some good things to add about your grow in order to get the best help.