Yellow leaves

If she's a true auto, she should already be flowering at week 7, meaning she doesnt need much N to begin with. Given the positioning, I'm guessing they just arent getting light so they're dying. That's fine, chop em off and post again if the issue returns.

I was having the same problem with my plants don’t think it n def cause my plants was n toxic just before flower and from week 6 yellowing travelling up the plant check your ph run off mine was at 7.2 then I flushed it now going to check run of at next feed make sure it not creeped up again but they look more healthy after the flush growing well