We only used a rat pink to try to stimulate him to eat with something live, and I didn't want to offer anything with teeth just yet because he seems so afraid of his prey. We've been offering appropriately sized f/t small rats aside from this recent attempt.
We've contacted the breeder, and they're gonig to get back to us sometime later today hopefully. I'm pretty sure that he was eating sometimes live and sometimes f/t large adult mice, but we definitely want to double check that in case we're going in the wrong direction.