I'm a bit surprised anyone would suggest a diet of FW fish for a Volitan. I can see doing it short-term when you first get the fish, making sure it is healthy and strong before making the switch to frozen. A long-term diet is just bad advice. I'm sorry you lost your lion.we took some advice here and started feeding them guppies
Volitans are the reason I got into SW. I just love them - awesome creatures.
IME, murph, keeping the lion off of live feeders will reduce aggression in the fish. Still, don't keep any small fish with him. Keeping him well-fed wil also help, but there aren't any guarantees. BTW, what tankmates will he have? Any fish you're concerned about?
I hope your lion is doing well.
Good luck.