Well, live feeders have no nutricional (sp) value at all. Also, feeder gold fish are bony and could cause a problem and make the lion choke. Then the feeders are live and are freshwater so, they could be carring fw parasites which could kill a lion. Then theres the possiblity that the feeder is sick. It'd be like eating a steak from a cow with mad cow disease. So, it's by far better to feed frozen food. If you're having trouble weening try mysis shrimp. My lion wasn't eating frozen, but as soon as I dropped some mysis in there, the went after it like a possesed monster.
-Mark