heres the deal with lions. If you dont get them started training to take frozen food, they wont live long. Start off feeding it mollys. (NOT goldfish), try your damndest to wean it on frozen sand eels, silversides, squid, SOMETHING with some nutritional value.
oh yeah, make sure you vary what you feed it. Dont constantly feed it the same thing or you will kill its liver. Vary its diet as much as possible.