Just got my first milksnake about a month ago and I've noticed her color fading from bright red to a duller red/brown. She's only eaten once for me and has just shed her first skin, right after I put a "cave" in her cage. Anything I shoud be concerned with here? She handles well but doesn't seem real active. She usually hides or burrows in her bedding. I have an under the tank heater on one side.

