What is the appropriate water temperature for betta fish?

In this article, we will answer the question “What is the appropriate temperature for betta fish?”. We will also discuss how to keep the water temperature appropriate for your betta fish.

What is the appropriate water temperature for betta fish?

The appropriate temperature to keep a betta fish is between 76 and 82°F. Betta fish usually occupy small spaces, thus, they can be kept in small tanks with 5 gallons of water, for example. Some experienced aquarists claim that betta fish should not be maintained in water that is hotter than 82°F or colder than 74°F. Accordingly, we recommend keeping a betta fish always in a lsightly warm temperature.

This range we recommend is quite close to the temperature range they face in their natural habitat. They can handle small fluctuations in water temperature, but very high or low temperatures can cause serious health concerns for betta fish.

Why do betta fish require this temperature range?

Betta fish have particularly sensitive homeostasis or internal body temperature balance. If temperature changes occur, they have the potential to upset the betta fish homeostasis, putting their immune system in limited conditions.

Betta fish will function irregularly and indicate weakness and tiredness if the water temperature changes in an unfavourable way. The natural environment of the betta fish is primarily tropical, which is why it is critical to maintain the water temperature so that the fish may survive for extended periods. 

While you can’t replicate all of the nutrients found in nature in an artificial setting, you can adjust the temperature of the water. 

Betta fish are also unused to temperature variations in the water. They breed in a tropical environment with year-round constant water temperatures. Similar to other fish, betta fish are very dependent on the temperature of the surroundings. This is because they rely on this temperature to keep their internal body temperature.

Temperature changes will harm their activities including swimming, feeding, and even breathing. Thus, when keeping your betta fish in ideal temperatures, you will keep their metabolism healthy and functioning, and may even prolong their lifespan.

What happens if the temperature is too high?

Excessively hot water will influence the metabolism of Betta fish, as previously indicated. When compared to cold water, hot water has fewer oxygen molecules. 

As a result, your betta fish will start breathing fast or may begin to float to the surface of the tank searching for oxygen. Their metabolic rate may increase when they begin to swim wildly. 

They will eventually run out of energy due to their fast metabolism rate. Gradually, the random symptoms will wear the Betta fish down, and a major episode of exhaustion will take its toll on the fish’s overall health. 

Betta fish have a greater metabolic rate, which causes them to age faster and live shorter lives.

What happens if the temperature is too low?

When betta fish face too cold water temperatures, their metabolism slows down. If the temperature dips below 74°F, the cold water will cause injury to individuals who are exposed to hot water. In cold waters, a betta fish may face a variety of metabolism functioning issues, once they will not be able to keep their internal body temperature warm.

Lethargy is one of the first signs you’ll notice. It is possible that your betta fish will swim significant less than normal, or even not swim at all. Rather than seeking oxygen, they will seek warmth at lower water levels. In chilly water, the fish will also avoid feeding, which might lead to malnutrition. 

Betta fish may fall into a life-threatening coma in extreme circumstances, necessitating rapid action. Betta fish are more susceptible to germs, infections, and illnesses due to their slower metabolism. Cold water may result in extremely dangerous infections and affect your betta fish immune system severely.

Does the water temperature need to be stable?

Betta fish are used to constant water temperatures in their native environment. It is possible that the tank water temperature fluctuate according to the environment the tank is placed in. Thus, temperatures changes in the room or direct sunlight may iimapct on your betta fish health.

Betta fish can survive in water temperatures ranging from 76 to 82 degrees Fahrenheit, but they will struggle to survive in temperatures outside of this range. Temperatures outside this range could harm your betta fish immune system. Following you can find some of the direct issues that temperature instability may cause in betta fish.

Betta fish can suffer with:

–       Temperature shocks

–       Changes in metabolic activity

–       Breathing issues

–       Weaker immune system;

–       Diseases such as fin rot and constipation

How to keep the water temperature appropriate for betta fish?

We can clearly infer, based on some significant studies, that controlling water temperature is crucial for Betta fish longevity. Below you can find some suggestions on how to keep the water temperature ideal for your betta fish.

Use a thermometer  

Monitor the temperature of the Betta fish water with a thermometer. Thermometers provide reliable data. Invest in a reliable thermometer and don’t rely on the aquarium or tank’s thermostat.

Use a heater 

A heater is also required to regulate the temperature of the Betta fish water. Invest in a reliable heater that will not break frequently. However, you must exercise caution while using a heater because inexpensive heaters can easily cause the water to overheat, which is detrimental to the fish.

Change water gradually 

If you are replacing the water, check to see if the temperature has not changed. Betta fish will be shocked by a sudden shift in water temperature. In the case you put too hot or too cold water in your tank, your may rely on a heater to regulate the temperature, or even put more water for rapid control action.

To prevent causing a substantial temperature change, you should try a partial water change of only 5-10 per cent.

Keep the tank in an appropriate room/area

It is important to keep the tank in areas that are far from windows and wind passage. You can maintain lamps and heaters around the aquarium to keep it warm in the winter. Avoid direct sunlight and place the tank beneath fans or air conditioners in hotter areas.

Aerate the water 

Betta water temperatures drop, reducing the amount of oxygen available. Aerate the water to ensure it has enough oxygen. Betta fish may take oxygen and breathe comfortably in this manner. If you do not know how to aerate the water, all you have to do is use an airstone.


In this article, we answered the question “What is the appropriate temperature for betta fish?”. We also discussed how to keep the water temperature appropriate for your betta fish.

If you have any thoughts or doubts, feel free to drop us a comment below!

Frequently Asked Questions (FAQs): What is the appropriate water temperature for betta fish?

Would 84 Fahrenheit be appropriate for a betta fish? 

This temperature is not a deadly condition for a betta fish. However, it may cause them to become uncomfortable. Yes, your betta fish could live in a tank with water at 84°F. It is, however, much outside the range where a betta would feel at ease and your betta fish will probably show some signs of stress and even pain.

What is the temperature range that betta fish can survive in? 

Bettas have extremely specific requirements when it comes to temperature. The ideal temperature for a betta fish is between 78 and 80 degrees Fahrenheit. They can, however, endure temperatures as high as 85 degrees Fahrenheit and as low as 76 degrees Fahrenheit.

How do I determine if the temperature is too low for your betta fish?

While a sleepy betta fish might be an indication of a variety of diseases, it’s also a sign if the aquarium is too cold. The metabolism of a betta is slowed by cooler temperatures. This slowdown is accompanied by inactivity and a loss of appetite. When the temperature in your betta’s tank falls below the optimal range, you’ll notice that your betta doesn’t eat as much, if at all.

Do I need a heater for my betta fish tank?

Yes, it is strongly recommended to use a heater in a betta fish tank to keep the temperature stable and between 74 and 82 degrees Fahrenheit. Choose a heater with a 5-watt power rating for each gallon of water in the aquarium. A heater may be required at either end of a large aquarium. After filling the tank, wait 15 minutes before turning on the heater. 

How often should I change my betta fish tank water?

Small water changes of 10-20 per cent once every 7-10 days are excellent for your betta’s health if you are using a filter in your tank. You can also conduct 20-30% water changes every 2-3 weeks, although smaller water changes are best for maintaining stable water conditions!

How often should I offer food to my betta fish?

We recommend offering food to your betta fish at least once per day and at the maximum of twice. When pellets are submerged in water, they expand and become extremely filling for your betta. Instead of pellets, freeze-dried or fresh food can be utilized one or two times each week.


Betta Water Temp Guide (What You MUST Know! https://www.bettacarefishguide.com/betta-fish-water-temperature/

The Perfect Betta Fish Water Temperature. https://bettasource.com/betta-fish-water-temp/

Betta Fish Water Temp Guide: Keep Your Tank Not Too Hot or Cold. https://japanesefightingfish.org/betta-fish-temperature/

What Temperature Does Your Betta Fish Prefer? 2018. https://blog.backtotheroots.com/2018/04/12/temperature-betta-fish-prefer/