OMG,

I am in the process of raising 150 + goldfish fry and got tempted by some rather fat guppies in the lfs, bought them home and hey presto if the first lot haven't just been born. I know I have to be ruthless and am going to leave them in with the parents, my question is how to feed them without attracting any attention to them (I don't wanna kill them intentionally) or will they just eat what the parents miss?
Any advice would be appreciated as they haven't had anything to eat yet, I don't know what to do for the best.
HHHHHHHEEEEEEELLLLLPPPPPPPP please!