darkling

I would like to feed my chameleon a darkling beetle every once and a while for variety and i was wandering how you do it. Do you free range them or are they aggressive? Do you have to cup feed them or what? Do you have to prepare them in any way? Thanks very much.

You know how mealworms are the larval form of the darkling beetle and that you can't feed to many because of a build up of chitin well can you feed the pupae or the darkling beetle or will chitin still build up thanks.