![]() Other factors that impact a fish tank’s temperature include its location in your home. Recommended heater sizes for different types of aquariums However, if your home is on the colder side at 65☏ and you need to raise the water temperature by 15 degrees, then consider adding a second heater. ![]() For example, if you have a 29-gallon tank under those conditions, the suggested heater size is 100 watts. The general rule of thumb is 5 watts (W) of heat per 1 gallon of water if a) you need to heat the water up to 10 degrees above room temperature and b) you’re using an aquarium lid to retain warmth and prevent evaporative cooling. Other fish – like discus, ram cichlids, and certain Apistogramma cichlids – prefer hotter temperatures around 85☏ and require a heater. Some species – like goldfish, Japanese ricefish, and white cloud mountain minnows – enjoy cooler temperatures and would be fine without a heater. However, keeping the water at a steady warm temperature is less stressful on your fish and therefore helps prevent diseases. Now it’s true that the majority of aquarium fish can tolerate cooler temperatures than recommended because in nature, the environment dips several degrees at night or during rainstorms. So, if you usually keep your home cooler than that, then the answer is yes. One of the most common questions we get is, “Does my aquarium need a heater?” Well, most fish are cold-blooded animals that rely on the surrounding waters to regulate their body temperature, and most freshwater pet fish are tropical species that enjoy balmy temperatures around 78-80☏.
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