Aquarium Fish Tank Heaters help create the perfect environment for your fish and aquatic plants year round. One of the most important parameters to keep in check is the temperature of your water, At Aquaholics our range of submersible heaters cater toevery tank size from nano betta aquariums to large predator fish tanks. Most fish are very sensitive to temperature and need a submersible heater to create a warmer environment that promotes health and vitality. Colder water can make some fish dozy or slow which slows down their metabolism. All our heaters at Aquaholics feature an automatic thermostat that automatically turns the heater off once the set temperature is reached and will turn back on once the temperature drops again so you save money on electrcity and while keeping your fish at a safe temperature.