I recently became the owner of two adult Green treefrogs myself. I am using a heat lamp, placed up and off to one side of the tank to create a warmer area while the rest of the tank is kept at room temperature. One of the frogs seems to have figured out where to sit during the day; as well, the crickets I put in there last night have collected close to the heat source as well. Might make feeding time easier for them!! Best of luck with your frog.