AK48 3 weeks

Here are my 5 girls at 3 weeks vegging under a 600w MH, I topped 3 of them and will let 2 of them grow naturally. I just started feeding them, Roots Organics Buddha Grow. I'm thinking of flipping them into 12/12 hps in week 4 or 5 depending on the size they are then. My biggest female has a little yellowing on the lower leaf( you can see in the picture) I don't know exactly what its from, I was thinking nutrient deficiency?

looking good m8 nitrogen deficiency may be causing your lower leaves to yellow

Looking good, top them at week four and flip the switch at week 5 and you should be golden.