Quality Pictures: heat burned seedlings?

These are about 3 weeks old. Tips are browning in spots, and curling. Growth seems stunted.
I may have had the light too close (18") for about 16 hrs at one point, about 4 days ago.

• 78-81F in box, humidity was up to 80%, now down to 45-50%.
• 400W MH and 4 100w eq 5k CFL, Lighting is 18/6.
• Distilled water, no nutes, 005ppm, 5.2-6.2 ph adjusted 1-2 times daily, 70'f steady, Mister is 1 hr on 1 off.
• Seeds started in Rockwool cubes now in hydroton, Roots have begun showing through the net pots, hanging 1-4" below pots at this point, but just a few per pot.
• Strain is Nir. B-52, have been displaying slow growth since start under 3 60w eq full-spectrum cfls w/ a heat mat and air temp at ~84'F.

I think that I may have burned them. I was also concerned with maybe needing to feed them?
Can anyone confirm?

I guess if I did, than I just have to wait for them to heal themselves?

Is there anything I can do to help at this point?

I'm also going to post a thread about some odd growth(which may be normal for all i know), but I don't believe it to be related, but i guess i'll come back and add a link once i do - just in case...

I had the same thing happen to my plants, and the only answer i could find was this

HEAT STRESS

It basically said to move the lights up and wait it out. Maybe someone can provide a better answer as to some steps to recovery from heat stress.

the same happend to me. left my box closed. came home, temps were at 112f CRAZY couple leaves got toasty but everything is fine. almost a month growing it and its looking good. wait it out.

Yeah for sure man, when i first started growing i was worried bout everything...More i grew more i found out its almost hard not to get to flowering. Even then its pretty easy.

Hey I was wondering if someone could help me out? I have a 5 day old sprout(Dinafem Auto RoadRunner) thats got the two oval looking leaves and the leaves appear brownish black?? Is it because of the lighting? I have her in a small party cup with two 40w flouresent bulbs. I was thinking maybe I shoul take one out, like one of the bulbs? Cause I have te cup in a 5 gallon fish tank for humidity. Please help its the only seedling that sprouted out of 35 that I had bought.