The Ultimate Guide to Angelfish Temperature Preferences

Angelfish are liked by aquarists not only because of their tall, pointed fins and bright colors but also because they are peaceful and hardy. As long as you keep them in the right temperature and conditions, they are easy to care for. In this article, we’ll cover what you need to know about maintaining the ideal temperature for your angelfish tank.

What Temperature Do Angelfish Like?

Angelfish will be happy in an aquarium between 75°F and 82°F. This is pretty hot, especially if you think about how other fish in the tank you’re taking care of might find that water too hot and get stressed. They need to be kept in a warmer fish tank, so if you want to keep them, you may need to buy a heater.

As tropical fish, angelfish do best in warm water. They may become stressed and lose their appetite if kept in cool or cold water for too long. This can cause the immune system to weaken and function less effectively, increasing the risk of developing severe health problems.

Because of this, it would be better if you give your angelfish their own fish tank. Even though angelfish don’t swim in schools, they would love to be close to other angelfish. If you want to add other fish to the tank, choose an aquarium fish that can live in warmer water.

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Do Your Angelfish Need A Heater?

Angelfish need a heater for sure if you want them to stay healthy. Most of the time, these fish need warmer water than room temperature, so you will need a heater to keep the water warm. You will also need the heater to keep the temperature in your aquarium stable and less likely to change, which can stress out your angelfish.

However, you can’t buy and put any aquarium heater in your fish tank. There are many kinds of aquarium heaters, so you should choose the one that works best for your tank. When selecting an aquarium heater, you should also consider the size of the tank to get the most out of it.

Even though an aquarium heater can help keep the water temperature stable, you should still keep your aquarium away from places where the temperature changes a lot. For example, under air vents or air conditioners, near windows, or where the sun shines directly on the floor. Their effects on the aquarium’s temperature may not always be evident, but they can have significant impacts.

How Hot Is Too Hot For Angelfish?

Angelfish can live in water that is up to 82°F hot. Some aquarium owners have even said their angelfish lived in aquariums with temperatures higher than 82°F. However, you shouldn’t keep your angelfish in water that is too hot for them to handle because it can lead to serious health complications. 

If the aquarium is too hot, the angelfish’s systems will work faster, making them more active and needing more oxygen. But as the water heats up, it can hold less oxygen, suffocating your angelfish. If this keeps happening, your angelfish will get tired of gasping for air, which will stress the fish out and could even kill it.

To prevent that, set the aquarium heater to around 75°F and 82°F. You can also help cool down your aquarium tank by putting a fan in front of it, removing the lid, and putting ice packs in the water. Remember to drop the temperature slowly, about 1°F every 8 to 10 hours, to prevent shocking your fish.

How Cold Is Too Cold For An Angelfish?

Temperatures below 65°F are too cold for your angelfish. They won’t die immediately if the temperature drops below that, but the longer you keep them in the wrong water temperature, the more stressed they will get. And the cold water and the stress will kill your angelfish over time.

If you put an angelfish in a cold aquarium, its digestive system might work slowly, causing it to get constipated or lose interest in food. Not only that, but a cold fish tank can also make your angelfish sleepy and slow. Ich is also more likely to spread to your fish because the parasite thrives in cold water.

To heat up your aquarium back to the correct water temperatures, install an aquarium heater and set it to at least 78°F. Also, cover your fish tank with a lid to keep the heat inside. As was already said, when changing the temperature, do it slowly to not shock your angelfish.


Can Angelfish Live In 75 Degree Water?

Angelfish can thrive in water that is between 75°F and 82°F. But they like temperatures on the warmer side of that range, which is about 78°F. If you’re worried that the water in your aquarium isn’t hot enough, watch if your angelfish spend much time near the aquarium heater.

Are Angelfish Sensitive To Water Changes?

Angelfish are not sensitive to water changes as long as you do small amounts of water change. If you do a water change with more than 60% of the water, you completely change the chemistry of the water. This can cause shock and stress, which are bad for the angelfish’s health and can lead to death.

Can Angelfish Live Without A Heater?

Angelfish are tropical fish, so they can’t live healthily without an aquarium heater in their fish tank. They need water between 75°F and 82°F, which is hard to get if you just let the aquarium sit at room temperature. Even without a heater, they can still live in an aquarium but won’t live as long as expected.

What’s The Lowest Temperature For An Angelfish?

Angelfish can survive at temperatures as low as 75°F while still thriving. But if you want to give them the best quality of life, keep the water around 78°F. Also, ensure the temperature doesn’t change much to keep your angelfish from getting stressed.

The Ultimate Guide to Angelfish Temperature Preferences


Angelfish are tropical fish, so to keep them healthy, you should keep them in an aquarium with warmer water temperatures, preferably between 75°F and 82°F. You may need to buy an aquarium heater to maintain the temperature. Your angelfish will surely be healthy if the temperature is kept and doesn’t fluctuate much.

About the author

Hey! I'm Antonio!

Betta fish keeper for over 6 years now! Since owning a betta I've also housed all kinds of tropical fish, and have seen all manner of problems and how to look after them!

If you need any advice you can always message me or better yet join the Facebook group where a community can answer your questions!

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