I assume the viv is 45 cm long rather than high.
IMO this is far too small and should be at least 60cm long x 30 x 30.
Dump the heat rock.
Buy a heat mat that is a third of the size of the base of the viv.
Buy a mat stat to ensure the mat does not get too hot.
The UV is a debatable point. As Leos are nocturnal they really dont see a lot of the sun.
They do need a damp hide to assist with shedding.
Unfortunately the "starter kits" sold by large pet superstores tend to be useless or only suitable for the first few months of the animals life.
If the employees of the business are not keen to tell you the most important things about the creatures you buy i suggest you buy them elsewhere. P
"Pets are part of the family so think before taking on that responsibility"
RIP Rockydog. 94-09