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 (low TDS and good pH range).

E-indoor
E-soil,
CSL-Black Gold (75%) Light Warrior (25%)
5g plastic bag pots, Sea of Green style
SCLR- Don't know
E- Tap water
E- All locals use tap => system, water is fine
E- 3 weeks 24/0 from clone, 5 weeks 12/12 into flower
E- DNF line (to sched) + Calmag (every other watering, ~2 watering/wk) + Seapal (6-2-2?) used in veg
E- Use schedule
E-1000w hps and 2-3'
E- 50 night 70 day
E- 65% RH
E-Lighting schedule - 12/12
E- Enough air flow
TR-Did you pre-soak your media in pH corrected solution? Tap water

The big question to me is: I use the same water/nutes/everything with all my plants, and two look like someone sprayed the tops with liquid death. The liquid death area looks alot like rust which is what a local friend of mine had recently. I think I have seen the begining stages of rust on a third plant, 3 1/2 ft away on the other side of the light. Rust being a fungi would explain the random two next to each other getting infected.

Possibly light burn? My fan broke a few days ago and I didn't go into the room until 3 hours after the light turned on. I just hooked up my spare fan ($12 Bizzard fan). The plants effected are the ones closest to the light, about 2' away from a 1000w. I moved the two sick plants to the end of my 4x6 area instead of on the side where they were before. Any help is greatly appreciated!

My last thoughts are Iron toxicity possibly.

You're running REAL chilly and your day/night swing, especially in the 'hot spot' could be not only causing physical stress to teh upper leaves, but also creating conditions for dewfall when the lights go out and the resulting fungal diseases that damp plants are prone to. Also if your bags are on a cold cement floor you have GOT to lift them up to keep the soil from getting that cold- cold wet soil that is acidic will kill plants!!! Get your night minimum temps up to 65'F, and yup you need to get your air flow back where it was before the problem. I think you are seeing a set if environmental factors working together to create this problem. I'd pick up some Serenade too and do a light mist right at lights-on with it. It's an organic live-culture fungicide that is safe for flowering plants.

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.

Propping up the bags on a grate or milk crates and slitting some more holes in them will help with the cold and damp.

Thank you for the help. The sick plants have been culled from the crop since the damaged area was just getting worst and the plants looked horrible, but it was not spreading. Myself and some expert growers I consulted believe a certain person sprayed the two plants on purpose... No big loss, moved on already :)