Burrowing is completely normal for these guys.
Heres mine in it's normal state.
Buried just so he can see out. LOL
They are ambush predators ( meaning that they hide and let the food come to them.)
Here is a good
care sheet.
He looks very healthy his colors are nice and bright.
As far as #2 goes he might hide it from you or some like to go in their water dish
As far as feeding goes I would broaden his menu a bit.
Night crawler pices , dubia nymphs no bigger than the space in between his eyes.
Dusting in addition to gut loading the feeders (crickets and dubia ) are simple
I would gut load 100% of the time. and dust multivitamin every other day and calcium with D3 once a week by it self no multivite.
and when it gets above 2 inches SNV start giving pinky mice once a month. until adult hood and then rat pinkies every 2 months or so.
But night crawlers as a staple with dubia.