He eats Large comet gold fish.

There could be many reasons why he will only eat fish and mice, one reason could be that the crickets and worms are to small and don't really catch his attention, he is veeeery big. Another is, the people that had him before raised him only on crickets and when I got him they said he was refusing to eat and because of that he lost a lot of weight. I tried him on jumbo night crawlers and he just turns his back on them only eating when I offer fish or mice. Finicky like a cat.