ok, first off it looks like he is in shed so you will need to provide humidity levels between 60% and 80%.

he is thin, and small if he really is 5 months old (but I doubt that is actually the case)

You should weigh him and feed him rodents that weigh 15% of his body weight. (I would say mouse hoppers or rat pups at his size)

A pic of the set up would be greatly appreciated.