Baby plants leaves turning brown and curling...

I transplanted the seedlings into their hydro grow pots about 4 days ago, and shit started rolling downhill from then. I have included pictures to show the general setup and how the plants look. After the leafs started to brown at the tips (1 day) i fertilized according to the bottle with GH flora-grow. Some plants look good, but none are growing as fast as i had thought they would. This is my first time, so any help would be appreciated. Also, my water PH is right around 6.0, and im using a 1000 watt HPS light, suspended about 3 feet above the plants (its not too hot for them), and general intake and exhaust fans as well as floor fans on constantly. Im running these plants on a 24 hour light cycle. Thanks

anyone???????