Seedlings Leaves Are Curling Under

Help please, this seed sprouted like 3 days ago, everything was fine until this morning when I noticed the leaves are curling down. Its in a Coffee can with no nutrients and 24hr lights from two 23w floros. I know the picture sux but you get the idea, any help would be apprecited!!

what kinda flow maybe to high hope your using ro water is the rockwool touching where it needs to and nute (secondary more then anything) lil nutes but be gentle i call it baby nuting. like 3000 ppm.

too much N, methinks.

Thanx bung, its a DWC setup, using RO water PH right now is 5.6, no nutes at all-I am assuming you ment 300ppm not 3000!!! The sure to grow cube should be fine and there is plenty of air bubbles being formed

maybe to much try slowing down flow see what happens sorry nothin like losin babies GL.

I am having the same issue with some of my 10 day old babies in DWC. The ones in the middle of the tub, and also the most developed, have their first true leaves curling like yours. However, the ones on the perimeter, in the same nute solution (~300ppm / 5.5 pH drifting to 6.5), look fine. I originally was thinking my nutes were too strong or the plants were too wet, but it's going on the third day with the inner curled/outer normal pattern, so I'm thinking maybe it's light intensity. It doesn't seem to be holding back growth for me, so I am leaving the light where it is.