Is my baby not doing good?

Helllo kind earthlings!
Doing first time LED 900V from Viparspectra.
Handling with the light as learned...but still, something new/weird.
What's with the leaves ? (PHOTO 1), compared to other one (PHOTO 2)

Can it be Co2 ? Bcs of LED i need to do some fresh air intake change (LIVING ROOM).

Thank you!

Kids Looks fine to me...... Did you take the pics right after watering? A little drooping is normal

No, not really, it's been 2 days since last watering.

Leaf tips are clawing. Could be a few things.

1Over or under watering. 2 A little too much nitrogen in the feed. 3 not enough light. Are they the same strain?
what's the distance from the light to the top leaves of the plants

Never did over, but never had 20L pots either.
Light is about 80 cm away.
No, strain is different, drooping one is a CBD strain.
They are 15 days old from seed and did add min.of root juice and Biobizz grow.
Thanks.