How to Lower High Aquarium Water Temperature

Aquarium with Goldfish

During summer heat waves, most people understand the need of providing a cool environment for their cats and dogs, but what about fish? Even if your fish are in water, they are still susceptible to the effects of high temperatures. During the summer, if there is a power outage or no air conditioning, the aquarium water may heat up to dangerous levels for the fish. In these uncommon situations, it's critical to know how to chill the aquarium water.

Safe Temperature Range

Heat may become a concern if it is consistently high for an extended length of time, as it may be during a prolonged hot spell. Angelfish, Guppies, Mollies, and Silver Shark will thrive in water temperatures as high as 81 degrees Fahrenheit (27 degrees Celsius). The Clown Loach prefers water as warm as 86 degrees Fahrenheit (30 degrees Celsius) and is most likely thanking the weather person for the warm water.

You do not need to be concerned as long as the does not exceed 86 degrees Fahrenheit or 30 degrees Celsius for several weeks. The dissolved oxygen in the water, on the other hand, diminishes when the temperature increases. You should have no problems if you have a decent filtering system. Nonetheless, increasing aeration to guarantee optimum oxygen levels won't hurt. You should also replace the water more frequently, using water that is a few degrees cooler than the tank water. This will help to keep the cool and ensure that your fish get enough oxygen.

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Reducing Water Temperature

In the event of a lengthy heatwave, you might have to take steps to cool the water. Here are some suggestions for keeping the water cool and ways to lower the temperature if it goes too high. 

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  • Make sure the room does not receive direct sunlight.
  • Remove the hood from the tank (use caution if your fish are jumpers). Also, keep an eye on any cats you may have. 
  • Place a fan so that it blows directly across the water.
  • Float ice packs in the water.

Whatever technique you employ, make sure to reduce the temperature slowly, around 2 degrees Fahrenheit or 1 degree Celsius every eight to ten hours. Rapid water changes are dangerous to your fish. From the moment the heatwave begins, you should monitor the temperature of your aquarium's water. Rather of having to find a means to cool your aquarium when the room temperature rises, you should do your best to keep it cold.

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