I was just wondering what temps you all keep your box turtles at night? I keep my house at 68 degrees and I've been just turning down their heat lamps to low on their rheostat during the night. I mostly do this because their substrate is usually damp and I don't want them getting chilly, but I'm not entirely sure this is necessary for box turtles. What do you think? They are still young....one is about a year and a half old and the other one is 8 months old.