My V. Lion is kewl he eats just about anything. Guppies, krill, and heck he even chomped a half cube of greens. I just want to say that i'm lucky to have him eat basicly anything.
I have only had my V. Lion for a month. He is about 6 inches and very healthy. He was eating both guppies and freeze dried krill at the lfs. I eventually had him switch entirely to the krill and used the guppies as a treat. Try to entice your lion to the top of the tank and slam the food in...