I am using aspen, but dont really like it that much.
Anyone out there using aquarium pea gravel? I used it years ago and used to wash it (w/ 10% bleach) to keep it clean. I remember liking it because it created a more even heat gradient and was not prone to being eating along with the mice. Buts its been a while and that memory could be off 
Vinny
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“There is a grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one; and that whilst this planet has gone on cycling according to the fixed laws of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved.” -C. Darwin, 1859
