Is there something wrong with the Papaya leaves? If you look at the pictures, it seems as if the leaf tips are curling down just a little. Not sure if its natural, or if there is a problem. They are being fed with Fox Farm's Grow Big and Tiger Bloom at 1/4 strength around 5.6-6.0 pH under a 400 MH. The Blue Moon is looking just fine, but for some reason I think that it should be a little bigger. I have also noticed that a friend's babies are younger than mines but the first couple of sets of leaves are bigger.

The first three pictures are of Papaya.
The last two are BMR.