catching himand moving him to a bucket is prob suuuper stressful.
and your hand feedin him prob doesnt help, hands could be scary...
was he hatched in an aquarium? generally i wouldnt hand feed newly hatched babys, id use a pole with a live shrimp on it whose legs id taken off.
how big is he?
what size tank do you have him in?
is his belly super sunken?
what are his tank mates?
you need to get food in him quick though or you may loose him and that may be pretty sad.