HoKuSPoKuS420 First Grow

Alright to start off I've been reading up for a while now, Decided it was my turn. I have a Box that I made out of a OLD chest. It's 48lX12hx15w I have a 20 watt Flouro in there for Vegetation until I can get some CFL's or a 70W HPS what ever comes first. Ok, I Don't Have a Camera so I don't have Pictures, I am in day 16 Vegetation from Sprout, i have 4 Leaf sites and growig new ons every other day. one of my plants go real tall and iI re Buried it up to it's fist leaves now a few days later all the leaves are Lightening and some curling under. Even new growt is doing this. Um, I read around and figured it was

Over Watering or
Light Burn or
Nutrient Burn

I think it's the fact im Over watering, I water every other day probably Half a cup. But I do the same to the other plant and it's still forest green.
Anyone know? I'll try to get a camera from a budd.