not that i have on or am planning on getting one i am just curious becuase i took my son to a pet store that is supposabley well known for having a different varieties of snakes and the had heat rocks in all of the cages..no its not a petsmart or any major pet store its a local family owned pet store...but are heat rocks bad no matter what or just bad without a thermostat for a snake? i personaly dont like this store..but my son likes feeding the turtles there...most of there snakes and lizards are always soaking in water when u go in there..sorry for the run on sentences and the mispellings....was just curious