The beauty of dubia's is they come in a variety of sizes from teeny tiny to big adults.
What you do is keep the adult females and a few adult males for breeding and feed off the rest.
For a little dragon like yours you would feed off the medium small dubia nymphs, as your dragon grows you feed off bigger nymphs. In a breeding colony there are always the right size nymph for your feeding needs.
Dubia are so much better than crix. They don't stink, don't easily die off, don't make noise and don't stink. I know I said don't stink twice, I like don't stink!
http://www.theroachguy is the place to buy your starter kit of dubia and a great place for more info about these wonderful, amazing and terrific feeder. I don't know anyone who has gone Dubia and regretted it, not a single person. Dubia are the feeder of the future, today!!!!
Eric