You will have no problem with low humidity in your terrarium with the addition of the Zoomed Compact Ultrasonic Humidifying Fogger! We tested it and were amazed at the ease of use and the clouds of fog it was able to generate. The Zoomed Compact Ultrasonic Humidifying Fogger has adjustable fog output control dial. Ready to operate. Includes one liter bottle and all necessary fittings. Easy to fill: Bottle screws onto "no-spill" valve for easy removal and refilling.