I really don't know what is the best temperature, but I try to keep my vivarium at 85 - 87 and the humidity is at around 75 - 80. These temperatures are an average of what mine has been kept in for three years. I don't have a hot side or a warm side, or a basking light. Low light, and high warm humidity. Sometimes in my hatchlings viv you can't even see in there because it's so humid.