What Is The Best Temperature For Goldfish?

What Is The Best Temperature For Goldfish

Suitable water parameters, including the temperature of the tank, have a significant effect on the overall health of goldfish. As much as goldfish can adapt to varying conditions in their tank, they often react negatively to a sudden change in temperature.

Goldfish are tropical fish, therefore, they thrive best at room temperature [slightly above or slightly below]. The optimum temperature for goldfish is between the ranges of 68-74°F [23-24°C]. This optimum temperature brings goldfish to be between being a cold-water fish and a tropical fish.

Although goldfish can survive at a temperature as high as 30°C and a temperature as low as 23°C, it is however not the best for them. You will notice a significant difference between goldfish living at this temperature and those living under the optimum temperature.

Goldfish living under the optimum temperature will certainly exhibit more useful traits. They are most likely going to be faster swimmers, have better digestion, have a more reliable immune system, as well as provide a good condition for breeding to take place.

Nevertheless, you might have to alter the water temperature of goldfish under certain circumstances. The two primary reasons why you might have to change the temperature of the tank significantly are for breeding purposes and disease treatment.

Water Temperature And Goldfish Breeding

Luckily for aquarists, goldfish are hardy and flexible in their environmental demands. As much as they prefer moderate temperatures, they can also adapt to an average change in the tank’s overall temperature. They can still cope under temperatures as low as 15°C and as high as 30°C.

The breeding abilities of goldfish are significantly influenced by their environment, particularly the temperature. Goldfish have a sensational breeding pattern that varies with the warmth of their environment. Their breeding is more favored in warmer water and less supported at cold temperatures.

Goldfish releases more androgen, which is their reproductive hormone in warmer water than cold water. This phenomenon is even peculiar to goldfish in the wild, and it serves as an evolutionary pattern to support the higher survival rate of larvae.

Therefore, you can mimic the seasonal temperatures of the goldfish habitat by altering the water temperature of the tank.  If you realize that your goldfish are already in their breeding season, you can keep the temperature of the tank at a warmer level. The temperature around this time is preferably between 24-28°C.

However, this temperature change has to be gradual and not drastic. A drastic change in the tank’s temperature can be harmful if lethal to the health of fish. Gradual alteration in the water temperature will work better and a sudden change.

Water Temperature And Treatment Of Goldfish

If you have diagnosed your goldfish of some specific diseases, you might have to alter the temperature of your tank to enhance the treatment. Sometimes you might need vets to recommend temperature change that will suit the health condition of your goldfish.

For instance, you might need to increase the temperature of the tank to about 30°C if you are treating parasites of the fish. If at all the parasites are not killed at this temperature, it will significantly reduce their life expectancy of the pests.

Warmer temperatures also reduce stress and discomfort in fish, thereby accelerating recovery time. Warmer water also speeds up the healing of goldfish by making the fish more resilient. It also makes the treatment of fish effective and produces better outcomes.

However, some other goldfish diseases require cold water instead of warmer water. An example, in this case, is the herpes virus. A study revealed that goldfish diagnosed with herpes virus living within the temperature range of 20-25°C recorded a 90% mortality rate; while those living at a temperature of 15°C recorded just a 10% mortality rate.

Overall, the variation of the temperature is mostly dependent on the nature of the disease. It can also be as a result of recommendations from vets.

General Environmental Demands Of Goldfish

Goldfish are hardy, and they can adapt to gradual environmental changes. Likewise, they are easy to maintain and do not need any unique ecological demands. All you have to do is ensure that they are only living with suitable tank mates under proper water parameters.

Aside from the fact that goldfish thrive best at a temperature of 68-74°F [23-24°C], they also love to live with a pH range of 7.0-7.4. You can also add a tablespoonful of aquarium salt per 5 gallons of water to keep the fish in a healthy condition.

Goldfish also love to live in planted tanks. It doesn’t matter if the plants are live or fake, as long as the plants provide shades and hiding places for them. It is, however, to choose plants that are compatible with goldfish. Live plants can also help in the filtration and improvement of the overall quality of goldfish.

You should also ensure the abundance and proper circulation of oxygen in the fish tank. Adequate oxygen level will help the fish to breathe properly. Low oxygen levels in tanks can cause the fish to be weakened and eventually pass away.

You should also ensure that the fish tank is kept clean at all times. You can ensure the cleanliness of the goldfish tank by making provision for both biological and chemical filtration. Also, you can carry out routine cleaning of the tank by changing about 10-25% of the tank water.  Water changes will help you get rid of excess ammonia in the tank, which can damage the health of the fish.


Goldfish are hardy, and they are easy to keep and maintain in the aquarium.  Despite being easy to care for, goldfish are still sensitive to some environmental factors, particularly temperature. The temperature of the tank can have a significant effect on the overall health condition of the fish.

Although you can alter the temperature of the goldfish tank, it must, however, proceed in a gradual process. A drastic change in the water temperature can be of a detrimental effect on the overall wellbeing of goldfish.  The temperature change can be essential during the breeding and treatment of goldfish.

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