The humidifier hose is attached to a do-it-yourself humidifier, just an aquarium air pump attached to an airstone in a plastic bottle and a hose going into the cage. The hose runs into the tank and down to the floor between the hides, but at the time I was trying running it along the side of the tank into an upper corner. I was using suction cups to stick the section of hose above the hide to the wall when he bit me.