Hi, I don`t know how big a 30g tank is, but I suspect much too small, but if it`s all you`ve got, and you can`t get anything else, I think the animal will not do well unless you upgrade very soon.
First thing to do is cover the back and sides with something (plywood or similar), just taped around the outside, that will offer privacy, and help stabilise the temps, there MUST be a solid top, anything other than a few small holes for ventilation will mean you lose humidity and heat.
I don`t know who told you Savannah monitors should not eat vertebrates (including rodents), but it`s NOT true, YES they can, if you support the monitor you can feed them without them causing "fatty liver disease", or any other health problems, those only come when the animal/s are undermetabolised.
Savannah monitors are NOT "specialist" feeders, they are generalists!
No handling whatsoever, the monitor must be given time to fully acclimate to the enclosure, so just placing food/water/ cleaning, etc.
Can you put a couple of photos up? It might help to see the animal`s condition, and whether there`s anything else to advise. Thanks!

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