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![Amazon.com: Customer reviews: Hydor ETH 300 In-Line External Aquarium Heater, 300w, 5/8" hose, Black](https://m.media-amazon.com/images/I/61Ds94xPtKL._UC256,256_CACC,256,256_.jpg "Amazon.com: Customer reviews: Hydor ETH 300 In-Line External Aquarium Heater, 300w, 5/8" hose, Black")