What Is the Best Temperature For Clownfish?

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Clownfish are easily one of my favorite fish. Before I bought my two juvenile clownfish, I made sure that I had done my research. I live in an apartment where the room temperature fluctuates a lot, so setting up the proper temperature for the clownfish tank was my top priority.

The ideal temperature for clownfish is in the 76 to 82 Fahrenheit (25 to 28 Celsius) range. Like any other tropical fish, Clownfish require a stable water temperature. Temperatures out of that range will stress your fish, weaken their immunity and cause long-term health issues.

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The temperature in my apartment was not ideal, so I needed it to figure out what I would do. The apparent solution was buying a heater and maintaining the desired temperature level.

However, before I did that, I ran some tests. I closely monitored the temperature in my tank for a whole week without a heater within it.

In this article, I will share my results and explain what other external factors could affect the temperature in your clownfish tank. 


Do you need a heater for clownfish?

Yes, clownfish need a heater in the tank. They are tropical saltwater fish and require stable water temperatures ranging between 76 to 82 degrees Fahrenheit. Without a heater in your tank, you risk temperature fluctuations that may affect your fish health.

One of the essential aspects of keeping a successful saltwater aquarium is providing a stable environment. When we say stable environment, we mean constant water parameters.

In saltwater aquariums, the most important parameter is salinity. The second most important parameter is the water temperature. 

Clownfish are very hardy fish and can survive in a wide range of temperatures. But we don’t want our aquatic pets just to survive but thrive and live a long and healthy life. 

The desired temperature for clownfish ranges between 76 to 82 degrees Fahrenheit. Make sure that you keep your tank temperature constant with minor variations no more than 2 degrees Fahrenheit in 24 hours.

External factors that influence water temperature

When you are setting up your saltwater aquarium, you need to consider all the external factors that could affect your tank temperature. Here are some factors that may have an impact on your tank temperature.

Tank Size 

My saltwater aquarium belongs in the nano reef tanks category. It can hold approximately 20 gallons of water. Because of the small volume, the water temperature in my tank fluctuates a lot. 

The larger the tank, the less the water temperature will fluctuate. Drastic changes could happen quickly in smaller systems, and your tank may crash. Larger aquariums have more room for error and, in general, are more forgiving. 

On the other hand, smaller systems are easier to heat. In larger aquariums, different areas will have different temperatures.

Keep in mind the size of the tank you plan to have and its correlation with the water temperature.

Lighting System

Beginners often forget the lights they have above their tanks can produce heat. If you have a smaller tank, then the light can affect the temperature in the tank, especially during peak hours.


Finding the best location for the saltwater aquarium in my apartment was one of the biggest struggles. I had a perfect open space for my aquarium, but it had a downside. It was next to a window. 

After some thinking, I decided to take the risk and set up the aquarium at that particular spot. I haven’t encountered any problems in terms of water temperature fluctuations. 

However, it might be different for you. Make sure that you always consider the location of your tank and how it could affect the water temperature.

Malfunction Heater

For my first tank, I went the budget-friendly route. In retrospect, it probably wasn’t the best decision. Low-quality equipment can make or break your tank.

Cheap heaters could stop work and drastically change the temperature in your tank. Clownfish are hardy fish and can survive a broad range of conditions, but drastic changes in the water temperature may affect their overall health.

Make sure that you always buy the best quality equipment you can afford for your clownfish.


Depending on where you live, summers can be very hot during the day and cold during the night. These fluctuations could have a negative effect on your saltwater aquarium. 

Make sure that the room temperature in your house does not fluctuate too much.

Final Thoughts

For clownfish, a temperature between 76 to 82 degrees Fahrenheit is recommended. 

Temperature fluctuations are stressful for your clownfish and could long-term affect their health.

Always consider all the external factors that could affect the temperature in your tank. 

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