To me looks like soil issues...most likley water build up / dampness.

Bags can create pockets that trap moisture. Not sure what I would do at this point....transplant asap if possible.
HARDDON Reviewed by HARDDON on . Possible rust/lightburn/FE/other? Pics 2 plants so far, next to each other show: Top leaves curling Rust looking spots on leaves White spots on small bud leaves Purple veins Bottom 1/3 plant Lollipopped, middle shows normal growth, some yellowing (normal amounts as it is ending week 5 of flower, top 1/3 is the messed up part... 2/35 plants started showing signs (see pic) 3 days ago. I flushed them with about 6 gallons of water and the problem looks to have gotten worst. I haven't heard of a pH problem with the tap water here Rating: 5