I used to have a few different reptiles,and yes those monitors are mean sum bi*ches,hissing and all that.It got to the size where i had to feed it full grown rats and i tell you man,watching that thing got pretty disturbing,so i got rid of it,but i used to have sorts of sh*t like that,a couple breeds of tarantuals,scorpions,all sorts of lizards and snakes and few different salt/fresh tanks aswell,but i lost em all when my place caught a blaze bout 2 years back.
btw,nice lookin lizard ya got,just try to handle him as much as possible.also when hes/she gets bigger watch for that tail hahahaha