I beliee alot of it has to do with where your
LFS gets their lions from. I happened to stumble across a gorgeous black volitan at petco (yes petco) for 44 bucks. What i did was actually had an employee feed him a silverside while i was there. He ate it without hesitation and i never had to "wean" him onto anything. Hopefully the same occurs for you, but if it doesnt, just go with a slight variety of
fw feeders until you get him switched over. Be careful though because ive heard that prolonged feeding of
fw feeders to a lionfish can cause a fatal digestive disease/problem