I've never fed dubias before, I have only fed crickets. But some beardies are different when it comes to veggies. For example mine, will not eat fresh veggies from the grocery store like normal beardies. He only eats the freeze dried veggie/worm mix that you mix with water. He's strange lol you could give that a shot, but you'll notice it eating more and more veggies as it gets older.