Need Help

[kenyaboa]

i have a kenya sand boa
whom has strange behaviors and i am unsure if his habitat is accurate

We have him in an 18x18x18 tank
with eco earth he can burrow into
we are keeping it moist and humid so far
using a red ultra violte light 100watt
and a heating pad

he only unburrows at night and then its to do this strange little dance against the glass in one corner of his tank. then right back under ground he goes

i'm wondering if we are doing something wrong
how do we tell it is a boy? he has sprus?
and what is the east african/kenya sand boas estimated temperment with being handled?