from what ive heard bamboo sharks especially when there babys are hard to feed you can get them to eat crill or anything else that your lion will but at first you need to feed him live food like little freshwater guppys
NO LITTLE FRESHWATER ANYTHING!
you cant feed saltwater fish freshwater food its very bad for them.. so scrap that idea..
second we need more info such as whats the tank size> other tankmates? water parameters? how long has the tank been setup? rock etc.
shark pups are very hard to get to eat and IMO need a very stable system with a few caves to hide in for him to feel comfotable and start to eat
the be3st thing to try is go buy some silversides put one ont he feeding stick and make it look like it is swimming around, this trick sometimes works.. the garlic is a good idea.. make sure the pices of food are cut up small enough that he can easily eat them maybe even smaller than normal, big pieces of food can intimidate a pup..