I would feed the ghost shrimp for now, but feed the ghost shrimp something nutritional before feeding them to your lion, you can also try live fiddler crabs. Pick up a feeder stick from you LFS, with the Antennata lion, I would try weaning with Krill, frozen mysis or you can try frozen sand eels.
Soak all of your foods in vitamins, once you wean you can start adding in Raw shrimp, crab, squid, octo & scallops. Feed until there is a slight bulge in the stomach area.
Kaye