Stunted growth

These were all planted at the same time. They've been above soil for about 10 days and are all in the same area, so they get the same amount of direct sunlight. What's going on here?
http://i50.tinypic.com/330wfnd.jpg

Nothing your fine. Plants dont grow at the same rate of speed. Just like humans. Your plants look good for 10 days!

Oh. Well, thanks. They are all Nirvana's Ice. I started 'em a little late (round June 15ish), but I couldn't resist but to try. I don't even really care much about yield, anything is more than what I had when I started.

Youll get a respectable yeild. Just keep a close eye on them. Especially watch out for bugs, those fuckers can ruin grows. Good luck