I've had the lion for nearly 3 years. The oldest picture I could find of him was from September 2005. Here you can see him with a ~1" astrea snail for scale. I feed him selcon and vita chem soaked silversides, krill, or sometimes clam every second day.
I had a really hard time getting him to eat frozen food at first. I think he nearly died of malnutrition feeding on guppies before I succeeded.