Mealworms have next to no nutritional value and a lot of chitin. As a rule of thumb, no mealworms till your dragon is 16+ inches long. From what I have heard, this is because small/young dragons have a kink in their intestine which doesn't "open" up till they get longer/bigger so they have a much higher chance of impaction. Try stuff like dubia roaches, hornworms, butterworms, silkworms, black soldier fly larva and my least favorite, crickets. A good staple veggie is collard greens too. It is very high in calcium and if you dust it with a little calcium, you got beardie superfood.