How do you get a lionfish to eat frozen food?

[ScubaSteve]

It's been mentioned before but I'll stress it: You need to know what the fish's eating pattern is. Volitans are stalkers/hunters and will typically, until acclimated to other food, not touch anything that is obviously dead. If they see the food fall to the bottom they consider it dead and leave it alone. Try to make a silverside dance in the rocks near where he hangs out and see if that will entice him out. I am assuming he's a wild caught fish, so he's still going to have the wild feeding response until you teach him otherwise.

As reefwars said, if he's hiding and not picking off your smaller fish, then he's probably stressed out. Have you seen anyone picking on him?