5 Gallon Aquarium Heater
3 Best small aquarium heaters for tiny tanks 1 – 10 gallons (20+ … 08/11/2020 · Best small aquarium heater for 2.6 to 5-gallon tanks. Check the price. The Hydor Theo is an adjustable aquarium heater. Most importantly, it’s the smallest adjustable heater on the market. Want your water hotter or colder to suit your specific…