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Amazon.com: PULACO 25W Small Aquarium Betta Heater with Free Thermometer Strip, Under 6 Gallon Fish Tanks (Preset Temperature 78℉) : Pet Supplies
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AQQA Small Aquarium Heater 15W/25W/50W/75W/100W Submersible Fish Tank Heater with Intelligent LED Temperature Display and External Temperature Controller for Betta Fish Tank and Turtle Tank 15W (for 1-5 gallon)
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