I have an eastern and a three-toed. Currently I have the bead-a-beast type of bedding, the kind that comes in a brick and you add water and it expands. It is made of coconut shells. Is this the proper type of bedding to use seeing as the eastern likes to burrow and the three-toed does not? Would it be suitable to add another type of bedding, such as sand to a corner of the tank for the three toed to enjoy? Any solid advice on what I can put in the tank on a budget would be great, thank you.