sum questions...

[Muhahaha]

1) there's this thing called coconut brick and you soak it and it expands.... is t ok for a substrate for a corn, i dunno, i thought it was cool...
2)is it ok to keep switching subsrates or should you stick with one?
3) is it ok to keep 2 baby corns in a 30 gallon long tank, i know its not a good idea but i want to get another corn and keep them together
4)how much does probing cost? would a regular vet do it or does anyone know a herp expert in manassas, VA?
5) is sand an ok substrate? the sand i use is not dusty and i haven't heard my snake wheezing. i take him out of the tank to feed him so he wont swallow it. i tried reptibark but it was kinda dusty and it had sharp bits, plus my snake dug in it (he has hides but he liked digging a lot) and i was worried that he would dig to the bottom on the warm side and burn himself. sometimes hee would poke his head up while he was digging and he would have dust on his head. i bought some reptisand and i can see why people usually say sand is too dusty because this was superdusty but i only used a little bit of that.
so, all done asking (fer now :medtoothy ) thanks in advance