The folks are right about the guppies and gold fish, i had a lion fish that would not eat either, so we took some advice here and started feeding them guppies, and sure enough he died, There is some good advice here, on the next one, cause they are hard to start feeding and especially getting them on dried krill, but we used ghost shrimp in the beginning just to get some food in him, then i used squid, and believe it or not, he loved that, so then i would soak the squid and krill in a glass of water, and finally he just eats krill now.
hope this helps