What happened????

ok... around noon today my baby was doing fine. when I checked on it around 7, it was very droopy and weak. I kinda had the feeling that I may have overfertilized due to the leaf tips curling down and whatnot, so I was keeping a close eye on it. so... I decided to flush immediately and it literally perked right up in front of me. was it underwatered??
its exactly 30 days old from germination
running an ebb and flow, hydroton, 15 minute floods every 4 hours (except during lights off)
under a cooled 1000W hps (about 20 inches or so from the top)
room temps get to about 82 during the day, today was 78
last res readings were: 6.1 ph, 1200ppm
gh flora nutes
I'm going to keep giving it fresh water until the morning then go back to a lower nute solution.
any thoughts on what could have happened? still learning...

I think that there ok, make shure that your picking up your plants, and make shure that the pot is draining correctly. i had that problem that the hydroton rock would block the drain holes. leaves curling under usaly indacates a over watering problem. but i think that they look ok i wouldnt freek to much youll know bye tomarrow if theres a reason to be concerned.

possibly a ph problem also the small yellow spots that you have on one of the leaf pics indacates a small ph problem.