Fluval Flex has a red light that doesn't turn off, more info in comments : r/Aquariums
Fluval E Series Heater Operation & Troubleshooting Tips - YouTube
Fluval E Series Heater Operation & Troubleshooting Tips - YouTube
![Fluval T100 Heater 100W [26 Gallon]](https://www.mrpets.ca/media/catalog/product/cache/361e5aa3eae0788fba8f53d174389d53/t/1/t100_5.jpg "Fluval T100 Heater 100W [26 Gallon]")
Fluval T100 Heater 100W [26 Gallon]
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Best Aquarium Heater Tested (MOST Safe & Accurate 2023)
Best Aquarium Heater Tested (MOST Safe & Accurate 2023)
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