I think Michael Balsai has kept and bred quite a few, including tegu, but Melissa Kaplan only kept a few when she did a reptile rescue out of her home. They both agree, though, that rodent base diet is best for medium and large monitors like you said. I was reading their work because I don't think too many breeders are willing to share information and keep all the success to themselves. Those two are the only reliable sources that are willing to share. [shrug]