See I've never had to dust insects for my leo. She licks all her calcium from her dish. I've dusted crickets from time to time, but for the most part, she just gets it herself. Are there leos that won't lick up their own calcium?
I know worms are hard to dust because the calcium won't cling to the shells very well. He refuses to eat crickets, so mealworms are her only option. (she won't do roaches) I will recommend she see a vet to confirm MBD or not.