Leaves Turning Yellow on Sprouts

I watered my plants last night and since then some of the leaves started turning yellow. Will this go away? What can be done to fix it?

Thanks in advance. I just started, don't want to lose them! Also, my light is a foot and a half above the plants.... 400w

it look alright to me, but it could be getting to much light, or heat.

ph good? soil looks pretty wet could be either

Let it grow, Let it grow, Oh let it grow.