2nd grow droopy wavy leaves

this is my second grow, so I apologize if I don't cover every thing and sorry for the long post. But here goes, so my friend had 4 seedlings he couldn't keep, so I decided to take them. Anyways I updated my first grow setup which was a bunch of cfls, and now I have a 250w hps that I got for free. I'm using fox farm ocean forest with 25%perlite and i also have fox farm nutrients but I haven't began using them yet. Right now they're In 2 gallon smartpots about 13 inches away from the light and I try to keep the temperature around 72 ish but it's getting kinda cold here. I'm also adjusting the pH between 6.0 and 6.5 and watering every 2 days. They seemed to be doing really good after I transplanted them from red solo cups, but after a couple days they began getting twisted droopy leaves, cupping, and the new growth is light green/yellow but gradually gets greener, it also seems like the growth is really slowing down, I also forgot to mention they're on the 3rd or 4th week of veg. Does anyone have any idea why they might be acting so sad? any info would be helpful, thank you:)
 

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