you can find a glass aquarium thermometer for $2. making sure his temp is consistent and around 78-80f is very important. if its staying the same you dont need a heater but i would still get one just in case. you can find them for as cheap as $15.I don't think there is, but tomorrow when I clean his tank I'll check again. I don't have a thermometer, and I don't think the dean will let me borrow the dorm's for my fish tank.