We're not hand feeding, just leaving a dead fish to be eaten. But I'd have no issue with hand feeding a grouper. I shoot them too.
Grouper do eat lion fish on their own. I'm unsure of why the are unaffected by the toxin, but they are not harmed by it.
Grouper do eat lion fish on their own. I'm unsure of why the are unaffected by the toxin, but they are not harmed by it.