I didn't know that lions take live foods at first,
In your other thread "Going to buy a fish Saturday"...(which you conveniently deleted) you assured me you had researched Lions and their needs...
Give him a couple "days"...to acclimate and become comfortable in his new surroundings...If he's a healthy specimen, when he's hungry he will eat...
Fish do NOT need to eat on the first day in the tank, and often it's not a good idea to feed them for a few days to allow their internal metabolism to stabilize from the stress of capture, transport and being dropped into a LFS tank, captured and transported again...
Seeing a fish eat at the LFS before purchasing and knowing it's eating needs and patterns in a fundamental part of new acquisition research...as opposed to say "impulse buying" ...