okay several things that i see your doing different and i wanna help make some suggestion (improvement).. the 2 plant that are in the front are tooo FAR away from the light. your going to stretch it. a very stretch plant do not yield much bud IMHO.
2nd is that the one in the front right looks overwater just like humboldt14 said.
3rd i could tell u fed the babe in the far back left a lil too much N. u probably realize that but just in case u didnt no more food. straight water until next week
wut kind of soil are you using?
and can u add a few more CFL in there? once they get bigger ur gooing to need more than that for all 4 of these babes