over watering it small so u water ever other day till it gets 6 to 8 inches then water as needed an how high are your lights??
That plant is to young to be fertilizing. Wait until around the time the first 2 round leaves fall off or until it shows signs of nutrient deficiency. Like states above I water when I stick my finger in 3-4 inches deep of soil and its dry, sometimes I even let it go another day. Its a lot easier to fix an under-watered plant than an over watered plant.
Good luck on your grow
lets see some pics man
what strain are you growing?