Hydor 25W Submersible Aquarium Heater
Hydor 25W Submersible Aquarium Heater one of better quality heaters you can find in market. Their 25W heater is great for any Betta fish tanks or bowls from 2 Gallons or higher. Also they do have heaters for bigger tanks too. It’s worth buying a good heater so your fish can survive winter cold.