Northern light seedling, leaves curling up

I have a northern lights thats 15 days or so old, and for the the last week or so this has been happening:




Grown in biobizz all mix

125w cfl approx 3/4 inches away
No nutes yet
Temps 20.5c-22.5c
Humiditys quite low, was 30odd but ive increased it to 45-50.
Plain water (ph7) given about a litre every couple of days (dont want to over feed them)


Is it the humidity?

Her growth is alot lower then my blue cheese that sprouted a day earlier

i say it may be heat stress too much heat in the room, same thing im going through but different my leafs are curling outward an not inward like yours which in most cases its a heat stress not saying it is, Good luck!

Id have thought the temps were no where near too high? Lights a couple of inches further away then the BC which is taller and thriving.
Its my first attempt at an indoor grow so im probably wrong

Any more ideas anyone?