Hummmmmmmmmmmm....You are NOT suposed to feed any kind of earthworms (meaning true worms anelids, not mealworms, waxworms, phoemix worms,etc wich are insect larvae and ok to feed to fire skinks) to a fire skink, they are simply not adapted to deal with that kind of preyThe only lizards that eat earthworms are some Lacertids and specialy Anguids