Quote Originally Posted by seanysean
basically think it's a over water/feed or root probelm but unsure how to work that out?
Is this what all of the leaves looks like, and what part of the plant did they come from? Have you recently started or stopped adding anything? (CalMag, molasses...)
Are the greyish-brown spots mushy...? Or does it rub-off?

Have you been foliar spraying them too much? (trying to 'color-up' faded leaves?) Looks like damaged/clogged leaf pores. Doesn't look like the root rot I've encountered in the past, but I avoid root rot and haven't seen it in my garden in years. However, my root rot was showing a deeper yellowing from lockout, with the same greyish-brown necrotic splotches seen in your photo.

If it is root rot, I'd change my watering schedule, trim the roots and re-pot. Shouldn't be a major problem if it's 7 weeks from seed. (she can recover) If 7 weeeks into flower, good luck...should have called earlier, lol.
Seriously, if it's been 7 weeks in flower, you've got a choice to make. Either ride it out, or, repot in fresh soil. (trimming off dead roots) But this will delay further growth till stabilized in it's new soil, and depending on genetics, might stress it into becoming a runt or a hermie.

If it's mold (the dark splotches rub-off) or neckrosis from spraying too much, (clogging pores) I'd stop spraying. I spray maybe once a week in veg, but never in flower unless it's to correct defeciencies.

Kinda hard diagnosing root rot online, as most gardeners attempt to correct the initial stages with magnesium or iron, which compounds the situation, and changes the physical expressions of the underlying problem. (and it seems nobody except the hydro guys include pictures of their roots, lol)

Low doses of H2O2 is fine for early root rot, but adding too much, is like pouring salt in a wound. Plus it kills the bioactivity in your soil. Some folks swear by it as a regularly-scheduled additive...I'm not one of those.