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My Tetra 20-30 gallon submersible heater light keeps turning on and off. It's pre-set temperature is 79 degrees, and my tank is at 75. It is a new heater. I put it
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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
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Aqueon Aquarium Starter Kit, 20 Gallon High Glass Fish Tank, LED Lighting, Filter and Heater Included - Walmart.com
Hygger 916 Small Fish Tank Heater with LED Digital Temperature Display – Petnanny Store
Aqueon Aquarium Starter Kit, 10 Gallon Glass Fish Tank, LED Lighting, Filter and Heater - Walmart.com
