Help with seedlings

Hello every one.
I started my first homemade indoor grow about 2 weeks ago and my little girls seemed find.
I had to left them for almost 3 days and at night temps may have reached 15/12° c, when i came back yesterday they where looking like this...
they are less droopy but the brown/purple "spots" seem to be growing since yesterday.
If someone could help i would be really gratefull.

They could just be cold. 12°C is about 53°F.
That would explain the purpling.
Keep em warm.
Don’t feed them (assuming soil).
All you can do is watch and wait.

12 °C is too cold for fragile seedlings. Also your soil looks like it would benefit from some extra perlite

Try a seedling heating pad to encourage root growth and keep warm-ish. And like @Millo said, add more perlite or treated vermiculite. They need drainage.

thank you all, i ll do as you say and update later

Update
I gave up on the smaller plant
I repoted the other one and it stopped yellowing and started growing after 2 days, but the leaves still yellow to this day.
What should i do about that?
Also the nodes are growing too close to each other, should i do something?
Once again thanks for the help

McShell1 said:

Update
I gave up on the smaller plant
I repoted the other one and it stopped yellowing and started growing after 2 days, but the leaves still yellow to this day.
What should i do about that?
Also the nodes are growing too close to each other, should i do something?
Once again thanks for the help

Click to expand...

What's the pH? What kind of water? What is your soil? Light? Humidity?

Leaves don't regain color, new growth will show improvement.

More info is needed to really help. I would start over.

I´m doing it the cheapest way possible, not expecting much.
water pH is around 6.5,
soil is some random mix universal soil i had at home(38% veg compost, 30%coco fiber, 15% composted pine bar, 15% peat moss, 2% perlite),
running real 100w 4000k led and 5 10w 5500k cfl,
not sure about humidity
well ventilated.
If i had the possibility to buy better stuff i would.
Im sorry for the lack of detail and my english and once again thank you
Some photos of my cheapass setup lol

McShell1 said:

I´m doing it the cheapest way possible, not expecting much.
water pH is around 6.5,
soil is some random mix universal soil i had at home(38% veg compost, 30%coco fiber, 15% composted pine bar, 15% peat moss, 2% perlite),
running real 100w 4000k led and 5 10w 5500k cfl,
not sure about humidity
well ventilated.
If i had the possibility to buy better stuff i would.
Im sorry for the lack of detail and my english and once again thank you

Click to expand...

Its ok. I'm sorry if I was a jerk. I live in a place where things are very relaxed.

I'd use 10-15 times the amount of perlite. The lights are what they are. Wondering what EXACTLY is in your compost mix. "Veg compost" could be acidic, heavy nitrogen, have you tried ph testing the runoff water?

Im doing this as a test run. When i can, ill buy a proper soil mix, a tent and better lights...
Soils pH is bit basic at 7.6, should i compensate with more of a acidic water pH?
i ll test the run water next time i water then.
U was not a jerk i get you guys work with proper conditions