Lime green leaf and extremely dark stem. 10 days old...

So a little background. This is an Auto Seeds Polar Express growing in a DWC system with rockwool and hydroton. I doubt this seedling is more than 2 inches tall right now and it's showing those lime green leaves and one droopy cotyledon. Anyone have any idea what's wrong?

Nothing!!!!!!Leave her alone

Looks like it's just growing towards the light.

Stop spraying that poor thing!

It looks fine, just let it grow and dont try to feed it right away.

Just a normal looking seedling to me.

I agree with the above comments.
Is it 10 days from planting or sprouting?
Just curious.
Your seedling will feed off the cotyledon leaves,so dont worry if they go yellow.
Its time to start feeding then,but start very light,in general autos dont need as many nutes as photos.
You can always add more if you get a def.
Good luck FB.