@ Gorf311: what I meant was... I accidently made him jumped out of his hole (I shoulda made this clear, but then I was late to take my gf to the airport, thats why I didn't check what I wrote), now he is @ the same spot for a couple of hours, and I would like to know if he will burrow himself again?

What I noticed was that after he ate, he burrow himself DEEP into the substrate, to a point where I only see the eyes... is that normal after meal? And how would I know when he is hungry and when he is not?

And regards to the heat pad question on the 10 gal. tank, should I get one for 10 - 20 gal. or should I get a 1 - 5 gal. one? Reason I asked is because I will only place the heater on one side of the tank... thanks for answering my question and sorry for the confusion.