I hear they are hard to keep, simply because they are all wild captures and not tank bred, so they only eat live food. I'm trying to find a Fu Manchu that someone has already taught to eat frozen (I dream big lol). Are you trying with live or frozen? Also, I have heard of LFS feeding their lions goldfish, which is not good for them. Check with who you got the fish from and see if they have any tricks, or what/how they fed him.