AK-47 small yellow leaves

looks to me like either to much nutrients or the starting of root rot. what level do you have your water. it should be 1" below the net pot. top feed until a root drops down. Did you put them in there in the peat pellet? It might be holding to much moisture and drowning them. Once they get some roots out of that they should pick up. I would do a 10 ml water mixed with 10ml hydrogen peroxide(3%) mix and add that directly at the base of the stem. This will help get oxygen to the roots and also kill any root rot. As for your nutrients. they don't need much . I would cut it in half to .3 per L till they get some larger leaves.