The crickets are going to get their attention since Leos are attracted by movement. Mealworms can be very slow. Hence why they went after the crickets and not the mealworms. You should get a small bowl and keep mealworms in the tank at all times with some calcium on the bottom of the bowl. Make sure that the walls aren't big enough for the mealworms to escape, because they will. With the possibility of munching on your leos.
