My female panther chameleon is pregnant. She has been pregnant before but it was unsuccessful. I was hoping for advice this time around. This time I have a big plastic bin full of packed sand and heating it with heat wire wrapped around it that is hooked up to a thermostat. I believe one problem last time was the sand was to cold - I am attempting a heat gradient. What temp should I shoot for? Right now the sand around the outside of the bucket is about 76 degrees without adding the mercury vapor bulb yet.