![]() Generally speaking, most families have kept a goldfish at some point - in fact, common goldfish are the most popular fish species on the planet. In fact, many coldwater species are happy in colder conditions as low as 54☏ or even lower. The ideal tank water temperature for coldwater fish is around or below 68☏. What Are Coldwater Fish?Ĭoldwater fish are a type of fish able to live in cooler waters compared to tropical fish. Keep reading for a list of easy aquarium fish that don’t need a heater. ![]() ![]() If you’re interested in setting up an unheated aquarium, though, you may be surprised to hear which popular “tropical” fish are actually sub-tropical and appreciate the lower temperatures found in a cold water tank! Most types of fish sold in aquarium and pet shops come from tropical regions and require a heated aquarium. ![]()
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