I got two new Whites Tree Frog's yesterday and i cant get the temparature in the tank to go above 70°F at night. During the day the temp is 81-82°F. I read somewhere else on another thread that 82 degrees and dropping down to 70 degrees at night is too much and could be stressful for the tree frogs and i would hate for that to happen. Please help with what i should do for night time. I also read that heating pads could burn the frog so i dont know if i want to do that