Do you always leave a heat pad on for hermit crabs?

No, it's not necessary to leave a heat pad on for hermit crabs continuously. They require a temperature range of 75-85°F (24-29°C), so a heat pad can be used to maintain this environment, especially in cooler conditions. However, it's important to monitor the temperature and humidity levels regularly and avoid overheating, as hermit crabs can be sensitive to extreme heat. It's recommended to use a timer or thermostat to regulate the heat pad effectively.