the ones that have given me problems have eaten at the second offering of food, they usually go for it readily though (as soon as it hits them "oh this is food") I offer rosie reds on tongs and I have a bit better/quicker reaction if I hold the fish down on the ground as opposed to the way i feed the adults (they see tongs and come flying to me and will take the prey anywhere at any position)

I dont know if I posted this here before (though I'm sure I have)
but this is the very first meal to one of the little ones from the first litter,
you can see right when it realizes the fish is food