Keep your hermit crab buddies warm with the Zoo Med Hermit Crab Heater. This mini-size heater is designed for small hermit crab enclosures to help maintain proper temperature and humidity for your shell-hogging pals. It’s built like a pad and has an adhesive surface that you can stick on the bottom or on the side of your hermit crab terrarium―even on plastic. Because it works with very little power， it’s safe to use daily and can raise the temperature about five degrees. Plus， you can use it straight from the package with no assembly or set up.