It is very weak heat tape and yes it is under the back of two of the containers. Putting them on the sides did NOTHING to raise temps. These things are weak heaters to say the least. There is plenty of room for the frogs to burrow in front of them if they dont want that weak heat. (the room is in the low 70s at night and high 70s to low 80s all day long so they only need weak heat but the heat on the side wasnt even heating the cage at all. Also the smaller containers are within another wooden enclosure (pancake tortoises reside under them on the bottom) so they are pretty enclosed on the sides. And Tuko obviously doesnt care (top cage) as she is a pig and eats all the time.

Thanks!
Carole