Dinner for the lion:
1.) Mandarin... this should be a quick one to go.
2.) Yellow Watchman Goby
3.) Clowns.... maybe.
4.) Lawnmower Blenny

If it doesn't eat them right away, it will stress your fish out just having it around. Could you imagine being locked in a cell with a killer? Especially one that will grow to 10 times your size? Moreover, one that eyeballs you everyday, just waiting to grow large enough to eat you? I think that would spur your fish to become paranoid schizophrenic...