More fish often makes the hiding fish show themselves.
I have found it really important to over feed juvies. I gave a friend half a batch of red zebra fry, i grew mine up as i always do (huge filtration & over feeding) & passsed them onto the pet shop. They sold & then the same batch turned up at the pet shop & they looked alot like those, an odd shape & alot smaller than mine were & didn't have the same colouring. I know they are fed the same food so its definately quanitity that makes a difference.