20 plants suddenly dying, need help!!!

hi guys
I have 20 plants looking similar to the ones in the pictures and I can't figure out what's happening with them. the leaves look like they have oil on them at first, then turn dry and get white small spots. oh! almost forgot, there is a very wierd smell in the grow room. nothing like what it was the day before. they've been looking perfect 24h ago.
the only problem I could imagine is that the temperature droped with about 5 degrees(celsius) when I moved them on the floor. going from aprox. 25C(77F) to 20C(68F). which would make it easy for mold to come in?
they are autoflowering girls in their 4th week. I use florecent lights. just repotted no more then a week ago. they all started at the same time, but I used 2 different types of soil. the ph in water + nutrients has been between 6.5 - 6.9. been watering them every 3-4 days.
Any suggestions on how I could save them? They seem to go worst hour by hour.

how did the roots look when u transplanted? what do u feed with? hard to tell if those are not the actual pictures of your plants. could be "fusarium wilt"

Post pictures that aren't urs to figure out a problem that is urs?

Dropping temps will not make them more vulnerable to mold, especially with younger seedling / vegetative plants, as you can tend to sweat it out a bit more with them. It's if temps are too high along with humidity in the flowering phase which is the main threat to the buds, not a young plant. You say you used 2 different type's of soils? what are they?
Initial look at the leaves tell me overferting with the markings on them, but for the molded looking middle section, i am not so sure

ahm... those are the pictures of my plants, why do u guys think they're not?

found the answer in the mean time, it's called anthracnose: http://www.britannica.com/EBchecked/topic/27455/anthracnose
unfortunately three quaters of the girls are in the trash bin by now...

this plant I got from a friend was together with the girls... which is my prof that it wasn's a ph/soil/lights problem. it was poor ventilation.
thanks for your help, will do better next time

Looks as though your 'friend' gave you a cabbage sappling to me , cos that aint the headen weeden my man !! ^^^

no doubt about that! been surprised though how one man's crops can go down over night, regardless of the strain. so I reconed it would be good to share the experience, considering that this is my first time growing

Soo have you read anything i have written? you know the plant you pictured isn't weed? THe link you posted points to plants suffering from humidity too high, you say your temps went as low as 20c so how is it humidity.
pretty baffled by your approach to all this really , no-one else reading this or am i trippin ???

my approach is based on the asuption that someone might get the same problem in the future and could find all this useful.
my humidity was between 50-70% till now, I just added an extra fan and it dropt somewhere like 30-40%
this is why I posted that link: https://www.icmag.com/ic/showthread.php?threadid=214812
At the end of the tread there is one dud mentioning anthracnose.
Plus it's Saturday 05:40 in the morning where I'm at, and in stead of going out on a Friday night I had to watch my girls die...
I'll just roll one and go to sleep
thanks anyway, I mean it

im so kungfoosed...could be the blue crack tho

yes i am confused as well.... when you moved the plants into the new room did you move them from a table to the cold floor? maybe you shocked the root system and there dying bottum up maybe some root rot? these are just guesses you keep sayin weird stuff lol but i still want to try and help.

very wierd smell in the grow room

Click to expand...

The rootsystems are rotting and the medium stinks. Due to overwatering caused by low temps(pots take long time to dry) and cfls are not helping adding little or no drying heat. Get some hid lighting to get the temps to a more optimal range 24-26 and you will need heating at lightsoff because 6 deg is far too cold.

hey guys, sorry for all the trouble, I just realised that one of my house mates has sprayed the plants with oil, that's where the wierd smell was coming from.
Conclusion: keep your project to yourself.
thanks for your effort!