Jolly Betta Mini HeaterAutomatic plastic submersible heaters for fresh and marine water aquariums, paludarium and turtle tanks, designed for indoor use. Crafted with high quality plastic casing, JOLLY heaters are made to be very durable and safe. These heaters are suited to be placed beneath the gravel, making them a good choice for turtle or reptile tanks. Always on when submersed and stops working only when unplugged. The built in thermal protection intervenes when the