$25 · Hydor Substrate Cable Heater + Hydor Aquarium External Thermostat

Both in perfect working condition. They work wonders for my aqua plants. The thermostat turns on the cable heater until the environment reaches the desired temperature. The whole cable is 14 ft and the heating portion is 10.8 ft. Suction cups are included to position the heating cable under the substrate. With a substrate heating you promote the growth of your aquatic plants enormously by creating a water circulation in the substrate, which washes nutrient-rich water directly to the roots. Hydor external thermostat provides high precision electronic temperature control though a special probe positioned directly in the environment. ** Note: this substrate heater isn't meant to replace the regular tank heater.