dude, you sound like the type of customer i get that would tell me "he's doing fine" instead of thinking of the snake's well being instead of "what's fine".
what about humidity issues for shedding?
if it tries to burrow, it can get sand in it's nostrils or mouth, i've seen it happen with eco earth.A snake that is healthy to begin with is NEVER going to ingest sand. Why would it eat sand?
it's sand.....how can it be humid?If it was very humid it is possible that the dust that is in the sand clogged its nostrils but then you would have seen it breathing through its open mouth.
incandescent lighting is fine? what makes you say that? that type of lighting is for houses really. they provide no special rays that reptiles need like the light bulbs that are sold specifically for reptiles.Incandescent lighting is fine for heat provided you do not overdue the wattage. A 50 watt bulb in a 10 gal. tank can give you a hot spot over 115 F. Too hot.