![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://preview.redd.it/qx3jx0hlj5j71.jpg?auto=webp&s=6715cf22d90404c374485b9f23328ede7e738e99)
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 E300 Advanced Electronic Heater, 300-Watt Heater for Aquariums up to 100 Gal., A774 : Pet Supplies Amazon.com: Fluval E300 Advanced Electronic Heater, 300-Watt Heater for Aquariums up to 100 Gal., A774 : Pet Supplies](https://m.media-amazon.com/images/I/51ZGOiBRCNL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Fluval E300 Advanced Electronic Heater, 300-Watt Heater for Aquariums up to 100 Gal., A774 : Pet Supplies
![Amazon.com : Fluval EDGE Digital Aquarium Thermometer - 64 to 86 degrees Fahrenheit : Fish Tank Thermometer : Pet Supplies Amazon.com : Fluval EDGE Digital Aquarium Thermometer - 64 to 86 degrees Fahrenheit : Fish Tank Thermometer : Pet Supplies](https://m.media-amazon.com/images/I/61ZKuXEOX8L._AC_UF1000,1000_QL80_.jpg)