Ive had luck putting them in their salads along with silkworms/roaches/crickets as their main source of food.

I tried putting two dragons on different types of pellets, as their main source of food, one being repcal, the other I think Zoo med. Both seemed to result in stunting their growth and then not eating extended periods of time, runny colored poop and being somewhat skiddish, which isnt normal for any of the other dragons Ive had. Id need to test more to find out, but im just sticking to good ol' silk worms.