I have fed leo's some of the beetles and they loved them. While beardies should not be eating mealworms as a staple, Im not sure what the chitin to meat ratio is on the beetles or the actualy nutrional value. I would say just stick with the typical feeders for beardies, roaches, supers and crickets. If your already breeding mealies then Id suggest breeding some roaches. They take almost no effort and breed like crazy. If you can breed mealies you can easily hold down several colonies of roaches.