if your talking about his absolute favorite food, id have to say ......... bloodworms, of course! ill pinch a few if them and drag them across the surface of the water and he chases them around and attacks them like they owe him money or something!

its really neat to see him darting around grabbing them and gulping them down.
as for his second favorite, id say it was ghost shrimp (small).22 hunt them down like a cat. once they get too big, he leaves them alone so, ive got a few extra janitors in there.