leaves curling, drying out, rust spots

[MrAwder]

Background: Growing in coco coir mixed with roots organics cocomix (about 20% perlite overall). I have one satori from seed, and 4 clones from a FMS bubblegummer. The original bubblegummer just finished flowering and everything went fine. Used same coco mix, same nutes (Flora Nova Bloom and molasses, tap water Phed to ~6) So I don't think it is nutes or medium. The satori is more droopy and the BGer is curling more and the leaves are feeling crispy. I think the BGer are beyond help but I'd still like to know wth happened. Everything was around weeks 4-5 of flower. This all happened over about a 48 hr period, maybe a tad more but it seemed to get really bad very fast. Temps are usually 84F which I know isnt great, but my last run came out fine. It is getting cooler here at night, but I run my lights at night and my thermometer has the min. temp recorded at 64F.

So, any ideas?

Pics:

bubblegummer clones:

satori from seed:

 

[Neo 420]

Over fed and over water?

 

[Kushy]

Looks overwatered to me and a little nute burnt. I would hold off on watering for a day or two and then when you do water use a dab of hydrogen peroxide per gallon. A little goes a long way. Those might take a while to rejuvinate.

 

[trichy]

How fast does water run through your medium when you water? The plastic cup my need to have a few more drainage holes punched into it, on and around the bottom. Get it drying out more quickly so that you can get some diluted water through there.