I bought these fluval heater and it's made for up to 30 gallon tanks , but it doesn't seem to be heating my 20 at all, i have it set to 82
3 Best small aquarium heaters for tiny tanks 1 - 10 gallons
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HITOP Adjustable Aquarium Heater with Protective Cover, 50W 100W 120W Fish Tank Heater for 10/20/30 Gallon Fish Tank or Turtle Tank : Amazon.ca: Pet Supplies
Amazon.com: hygger 300W Aquarium Heater with External Digital Temperature Controller Reef Saltwater Fish Tank Heater for 30-60 Gallon Tank : Pet Supplies
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Best Aquarium Heaters for 10, 30, and 55-Gallon Tanks - PetHelpful
Best Aquarium Heater Tested (MOST Safe & Accurate 2023)
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NEW” Tetra Submersible Aquarium Heater 100W - 10-30 Gallon Fish Tanks Auto-Temp 46798264460 | eBay
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Tetra Submersible Aquarium Heater 100W, HT30 for 10-30 Gallon Fish Tanks : Amazon.ca: Tools & Home Improvement
3 Best small aquarium heaters for tiny tanks 1 - 10 gallons
Amazon.com: AQQA Aquarium Heater 100W Submersible Fish Tank Heater 10-30 Gallon Aquarium Betta Heater Small Aquarium with Suction Cups Thermostat Heater for Freshwater & Saltwater（100W） : Pet Supplies
Tetra Submersible Aquarium Heater 100W, HT30 for 10-30 Gallon Fish Tanks : Amazon.ca: Tools & Home Improvement
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Best Aquarium Heaters for 10, 30, and 55-Gallon Tanks - PetHelpful
