Whether you feed him guppies, goldfish, mollies or platies, the results will be the same. They are ALL bad for the health of your lion. It really is best for him to switch to a frozen diet, and it's very easy to do so. Get yourself some live ghost shrimp. (If you must feed your lion live food, these guys are the better way to go, especially if they have been gut loaded with a HUFA product). Also get some frozen silversides and thaw a few pieces out. Then take a live ghost shrimp and put it in the lions tank. After he eats it, take another ghost shrimp, but hold onto this one, either by hand, with tweezers, chopsticks, whatever. As soon as he eats that, offer him a silverside and watch how quickly he takes it! If you do this, everytime you feed him, and gradually reduce the live shrimp and increase the silversides, he will eventually eat anything that you offer him.
(My lion for some reason tho, won't touch squid(?))
And no, we don't............