Im not sure what care sheets youve read, but just so you know 90% of whats out there is outdated cr*polla. Pro-exotics has super caresheets. Daniel Bennet wrote the most superior Exanthematicus book on the market. Beware of what you read. You are in no danger of making youre basking spot too hot provided your monitor has options. Meaning, porvide a temp gradient. Like I said before, youll need a larger enclosure to maintain proper temps. 130ish on the hot side, 80ish on the cool.
I still cant get over that pic Mr. Retes posted of one of his monitors basking at 159! They like it HOT! Just give them options, so they can thermoregulate.
As far as mice. He can eat a rodent exclusive diet. Plenty of very experienced keepers feed only rodents. Theres everything they need, all package convieniently in one rodent.
Michelle