A towel is a good idea. Something as simple as a piece of cardboard on the side will help. Just make sure the air holes on the top and bottom aren't blocked. Sitting the incubator on a towel will prevent proper airflow. The older the embryos the more oxygen they need.
The heat elements in those styrofoams are only 40 watts. It takes a while for them to heat up and regulate.
The heat elements in those styrofoams are only 40 watts. It takes a while for them to heat up and regulate.