![Just got a Fluval E200 heater for my 20 gallon. Which temperature should I trust? Sticker thermometer on the side of the tank says around 78 : r/Aquariums Just got a Fluval E200 heater for my 20 gallon. Which temperature should I trust? Sticker thermometer on the side of the tank says around 78 : r/Aquariums](https://i.redd.it/qx3jx0hlj5j71.jpg)
Just got a Fluval E200 heater for my 20 gallon. Which temperature should I trust? Sticker thermometer on the side of the tank says around 78 : r/Aquariums
![Amazon.com: Fluval E200 Advanced Electronic Heater, 100-Watt Heater for Aquariums up to 65 Gal., A773,Black : Pet Supplies Amazon.com: Fluval E200 Advanced Electronic Heater, 100-Watt Heater for Aquariums up to 65 Gal., A773,Black : Pet Supplies](https://m.media-amazon.com/images/I/81cPfIKnmGL._UC256,256_CACC,256,256_.jpg)
Amazon.com: Fluval E200 Advanced Electronic Heater, 100-Watt Heater for Aquariums up to 65 Gal., A773,Black : Pet Supplies
![Amazon.com: Fluval E200 Advanced Electronic Heater, 100-Watt Heater for Aquariums up to 65 Gal., A773,Black : Pet Supplies Amazon.com: Fluval E200 Advanced Electronic Heater, 100-Watt Heater for Aquariums up to 65 Gal., A773,Black : Pet Supplies](https://m.media-amazon.com/images/I/81IYZLr3BpL._AC_UF350,350_QL80_.jpg)
Amazon.com: Fluval E200 Advanced Electronic Heater, 100-Watt Heater for Aquariums up to 65 Gal., A773,Black : Pet Supplies
![Fluval Vuetech Digital Aquarium Heater - E Series E200 - 200 Watts - Up to 65 Gallons (14" Long) - Walmart.com Fluval Vuetech Digital Aquarium Heater - E Series E200 - 200 Watts - Up to 65 Gallons (14" Long) - Walmart.com](https://i5.walmartimages.com/asr/19361715-5f2d-49f0-86d1-ce385165d0cc_1.94934a5a170eb30dd78684539243e526.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
Fluval Vuetech Digital Aquarium Heater - E Series E200 - 200 Watts - Up to 65 Gallons (14" Long) - Walmart.com
![Amazon.com: Fluval E200 Advanced Electronic Heater, 100-Watt Heater for Aquariums up to 65 Gal., A773,Black : Pet Supplies Amazon.com: Fluval E200 Advanced Electronic Heater, 100-Watt Heater for Aquariums up to 65 Gal., A773,Black : Pet Supplies](https://m.media-amazon.com/images/I/71r9RGNFLWL.jpg)