Lionfish acting lethargic and not eating

[steamman]

Something else besides a goldfish. That was the last meal mine ever had. The Lion fish ate it like there was no tomorrow and then gagged, and never ate again. I heard it was something about the bones getting lodged in its digestive tract and it can't eat anymore.

 

[Paul B]

Lionfish eat fish and almost nothing but fish. They also occasionally eat crabs. I can't see a goldfish bones affecting one.
I think something else was wrong with your Lionfish