When I raised black soldier fly's, I didn't have to get starts, they came on there own to some compost we had put out. I think the chicks are fine with the larvae. Keep in mind chicks need calcium for bone growth, etc, and the bsf are not so high in calcium that it will hurt them. in fact wild birds often catch the larvae and feed them to their baby's. I chop mine and feed them to my chicks while they're in the brooder. I give them about a cup and the chicks love them.