Hi. Unfortunately I didn't make note of the age in the various photos. I'd say 2 weeks seems about right for that second photo. I don't believe I fertilized until around the 30 day mark - which is pretty standard for my autoflower grows. When you have such a small plant in a pot, it doesn't take much water - until it starts to fill in and the roots take off.Could you give a few approximate ages of the plant from those photos? Im doing a similar grow, supplemented with cfls when there is no sun (my balcony only gets about 5 hours of sun). My seedlings are only 2 weeks old and they are about the size of your second picture. When did u start fertilizing?