Need help, Browning of leaves.

Hey guys i have some leaves starting to turn brown, Please help me out i am a noob so i dont know what this is lol. Thanks for your help.

Dude these plants are in rough shape. At a minimum I would transplant into fresh clean quality soil, get some quality nutes and start reading.
If you want to try and save these as they are I would flush with with a few liters of tap water each, add a reduced feeding at the end of flushing.

luck
Peace

What the hell are you feeding them? NPK values please. What kind of soil?

its only one plant, the three pics are of the same plant. I kinda think its cuz i touched those two leaves and maybe the light is too close? not positive but ive only fed twice in the past two weeks and it was 15ml of big bloom from fox farm in one gallon of distilled water. ive fed all three plants the same thing this is the only one that is having trouble. other then the one that is super small. i have a video of them if you guys want to watch on youtube u can see the other plants. http://www.youtube.com/watch?v=w5zG8JA0ov4&feature=feedu

What soil?

Im using all fox farm, soil is fox farm ocean forest, and for the nutes im using big bloom

I wouldnt use nutes this early. Also it would be advisable to check the temp under your lights.

OK, I don't have a clue whats in Big Bloom NPK wise, but it's a bit early to be feeding them high P blooming ferts anyway. FFOF is pretty hot all by itself from all the threads I see of people having problems. There should be more than enough nutes in the soil to last several weeks without adding additional nutes.
Also, ditch the distilled water, and use dechlorinated tap water. Tap water has dissolved minerals that the plant will use like Ca, Mg, Zn, Fe, etc.

alright ill stop the nutes but as for the temp... how the hell do you keep it down? i have an exhaust on it 24/7 and the intake is coming straight from the ac and it still stays around 80-89 F in the tent...

You got a fan blowing across the plants?

ok i was just using the distilled because our water is pretty hard, at least i think it is lol. Im really new to all this, our water is about 238ppm is that normal? or ok to feed to the plants? i think it tastes like shit lol

yes i do, just one osculating right now. its hard to find fans in the fall lol.

What kind of lights, and how close are the lights to the plants?

im exactly sure what npk means, but on the back of the bottle it says total nitrogen (n) 0.01% 0.002 ammoniacal nitrogen, 0.001 nitrate nitrogen, 0.005 other water soluble nitrogen, 0.002 water insoluble nitrogen... available phosphate (P2O5) 0.3%, soluble potash (k2o) 0.7% derived from earthworm castings, bat and seebird guano, rock phosphate, sulfat of potash magnesia, Norwegian kelp.

Ferts are OK. I'm leaning to the fact it's the soil, but I need to eliminate heat as well. What lights?

the lights are hortilux eye 600w hps and i have two of them, i know you should use MH for veg but dont have all that much money to keep putting in to this right now. once everything gets up and going then ill start tweaking things. the lights are about 18-20 inches off the top of the plants, I'm not sure if this is too low but two plants were starting to stretch quite a bit so i lowered them to this.

i kinda think it is the heat but how come its only the one plant that is doing this? also this is the only plant that ive touched. i dont know if the oil off of our fingers would cause it to heat up more then the other ones and i didnt want to gently wash it with water till i found out the exact problem.

1200w is a lot for those young plants. Use just one for now. I'd say they are a combination of heat burnt and nute burnt. Either wait and see if the plant adapts to the nutes, or transplant in some different soil without the added nutes.

if i move to only one light how high should i put the light?

18-24 inches for a 600 until you can get heat under control. I have a cooltube and the only time i can run my light at 600 w instead of 400 is when the ambient temp outside the room where my intake comes from is in the low 70's without getting above 80 degrees. After 85 degrees growth slows and you start to stress the plant.