Wilting

So I have these plants growing, maybe about 2 inches high now.
Anyway, question one is as follows: I was growing them with CFLs in a cardboard box. Then my 600W grow light came in, so I decided to rig that up inside the box. Damn it got hot!
When I came back, the plants had wilted.
Is this because it was way too damn hot? Too close?

Also, one plant is randomly more yellow than the others. Any thoughts?

At what stage do I start adding nutrients? I have "Iguana Juice"

Thanks guys

You're loving your plants to death. Don't start nutes until it gets over the shock from the first incident.

And don't water more thinking that will help, it won't...

Thanks dude. So I put the CFLs back on for now. I'm hoping they'll spring back up in a day or so?

I don't know, they're still wilting, about 5 hours later. Can't tell if its worse, better, or the same.
Anyone have a cure, or are these suckers a write-off?