I have the same problem and have a thread here.
Hello all, This is my firs grow and it's not going very well so far. I have feminized Bubba Kush seeds that germinated right away and sprouted out of the soil the day after I planted them. After that it's been down hill. See pics below. Below is my set up, I am using a 3 x 3 tent in the...
www.thcfarmer.com
I started to weight my pots so I could see if they were dry or not. Weigh when watered (wet) and then when dry. I have been told once you water don't water until pots are dry again.
You have a some yellow leaves, how close are your light's? Are you feeding them anything or, just the soil and water?