I would begin by feeding him mealworms by placing them in front of him in his tank one by one. Once he gets used to eating them he will eventually (most likely lol) find his way to the dish and recognize it as a meal and eat them on his own. If he's hungry he will look for food and should find them. Also, I would feed the meal worms the carrots before you put them into the tank. I usually just put a slight layer of powdered calcium on the bottom of the dish and the mealworms on top.