I fed my lion 6 ghost shrimp as a single meal, then I had to leave for 4 days. When I returned, I thawed a frozen krill and the lion went right for it. Contrary to common thinking, lions will NOT starve themselves to death. However, if you withhold food of 4 to 5 days, the lion should be about ready to eat just about anything. Make sure you are in control of the fish, not the other way around. Check out the aggressive forum, there are lots of great ideas about feeding lions over there.