Hmm your growth does seem kinda slow, and no it's not normal for the first set of true leaves to turn yellow so fast. My guess is transplant shock- the little gal has been through a lot in the past little while, what with starting nutes and transplanting. How strong are you mixing your Earth Juice? It should be at around 1/4-1/2 strength right now... The yellowing to me either looks like a shock from what i mentioned above, or not enuff nutes- judging by how light green the whole plant looks. Hope that helped.