![Amazon.com: Fluval M50 Ultra-Slim Submersible Aquarium Heater – 50W Underwater Heater for Aquariums up to 15 Gal. : Everything Else Amazon.com: Fluval M50 Ultra-Slim Submersible Aquarium Heater – 50W Underwater Heater for Aquariums up to 15 Gal. : Everything Else](https://m.media-amazon.com/images/I/71JRKsqOfHL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Fluval M50 Ultra-Slim Submersible Aquarium Heater – 50W Underwater Heater for Aquariums up to 15 Gal. : Everything Else
![Amazon.com : Fluval T150 Fully Electronic Heater for Freshwater Aquariums up to 45 Gal. : Pet Supplies Amazon.com : Fluval T150 Fully Electronic Heater for Freshwater Aquariums up to 45 Gal. : Pet Supplies](https://m.media-amazon.com/images/I/71BMj7Pup5L._AC_UF1000,1000_QL80_.jpg)
Amazon.com : Fluval T150 Fully Electronic Heater for Freshwater Aquariums up to 45 Gal. : Pet Supplies
![Amazon.com : Fluval T150 Fully Electronic Heater for Freshwater Aquariums up to 45 Gal. : Pet Supplies Amazon.com : Fluval T150 Fully Electronic Heater for Freshwater Aquariums up to 45 Gal. : Pet Supplies](https://m.media-amazon.com/images/I/81-FNu3itQL.jpg)
Amazon.com : Fluval T150 Fully Electronic Heater for Freshwater Aquariums up to 45 Gal. : Pet Supplies
![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 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](https://i.redd.it/5hzrbl79lb9a1.jpg)
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
![Amazon.com : Fluval T150 Fully Electronic Heater for Freshwater Aquariums up to 45 Gal. : Pet Supplies Amazon.com : Fluval T150 Fully Electronic Heater for Freshwater Aquariums up to 45 Gal. : Pet Supplies](https://m.media-amazon.com/images/I/81BZ+uKyPxL.jpg)