Weaning a dwarf zebra is the same as a fuzzy dwarf, if your lion is young it needs foods, young lions can starve to the point of no return. They cannot go long without food.
I just got a young dwarf zebra
How long did the LFS have it before you brought it home?
Hmmmmm, Lions will normally go for ghost shrimp, the ghost shrimp need to be enriched before feeding them to your lion. Try feeding the ghost shrimp at night when the lights go out, see if your lion is hunting at night, it is possible your lion is eating pods or crabs, considering it is young.
Are you sure it is not hunting with the lights out?
Silversides may be to big for a young lion, see if you can pick up frozen sand eels, they are usually smaller than the silversides. Try small chunks of shrimp, Crab, Clams, Scallops, frozen mysis (see if it snaps at the food) anything until you can get this lion to eat. Don't give up try and try again. Young lions can be a challenge.
Try feeding with the lights out, make your frozen food look live, not a easy task but it can be done.
If you have to use live for now, so be it. Yes, live feeders can result in a nutritional deficiency, Yes, they can cause fatty degeneration but neither of these develop overnight, they develop overtime. Your lion is young it will be in more trouble not eating than feeding it live right now, It is a decision you need to make with this lion.
Kaye