My cham is almost a year old. About 2 months ago I started putting a variety in his diet. Before that he strictly ate crickets. I introduced super worms, mealworms, and silk worms. Now when I feed him crickets he doesn't eat them. Instead he goes near the bottom of his cage looking for worms. I leave the crickets in his cage for a couple of days and he doesn't touch them. The moment I put some kind of worm in his cage he attacks it like he hasn't eaten for days. Has anybody else encountered this problem? How do I make crickets tasty again?