Do Cory Catfish Need a Heater: Can They Survive Without It?

Aquarium heaters are essential for keeping aquatic creatures warm and comfortable. They reduce the need to use expensive heating devices, but they also keep the water at the perfect temperature for your fish and other aquatic creatures.

A cory catfish does not need a heater to survive. However, many home aquarists that live in unstable weather keep corys in warm water climates set at around 74 to 80 degrees Fahrenheit for their comfort.

What Temperature Is Best for Cory Catfish?

The temperature a cory catfish needs depends on the climate in which it lives. In warm climates, they can survive in water temperatures of 74 to 80 degrees Fahrenheit (23 to 27 degrees Celsius). However, if the water temperature is more excellent than this range (below 68 degrees Fahrenheit), they will require a heater to keep them comfortable. In addition, a heater will help them to survive in cold water temperatures.

Can Cory Catfish Live in Cold Aquarium?

Corys can survive in cold water as long as they have a heater. Heaters help keep the water temperature around 74 degrees Fahrenheit, where cory catfish thrive. If the water temperature falls below this range, the fish will require additional warmth to survive.

Benefits of a Heater for Your Cory Catfish

A cory catfish needs a heater to survive in several climates, but one of the main reasons you might need one is to keep the water at a comfortable temperature for your fish. While they can survive in water temperatures as low as 68 degrees Fahrenheit, most corys enjoy warm water environments around 74 to 80 degrees Fahrenheit. Heaters help make this possible by supplying heat energy above and beyond what the ambient air can provide. In addition, they can also give a cory catfish an occasional head start on the water temperature even if they do not use it.

How Warm Should Cory Catfish Be Kept?

It would help if you kept cory catfish at around 80 degrees Fahrenheit. If the water temperature falls below this range, the fish may require additional warmth to survive. In addition, water heaters help keep the fish warm in colder environments.

What Happens if Water Is Too Warm?

If the water temperature is too high, cory catfish may suffer from sluggishness, poor vision, and difficulty breathing. The fish may also start to eat less and eventually die if left in these conditions for an extended period. In addition, the fish may also suffer from various skin problems, such as red or purplish blotches on the surface of the body.

What to Do When Water Is Too Warm?

If you notice that the water in your aquarium is too warm, there are a few things that you can do to help remedy the situation. First, you can reduce the amount of light and surface agitation present. This will make it harder for the fish to generate heat and even cause them to cool down. You can also turn off or adjust some of the filtration systems in your tank so that more cold water reaches the fish. Alternatively, you can install a water heater to bring the water temperature to the desired level.

How to Keep Temperature From Changing?

One of the biggest problems with keeping cory catfish in warm water is that their environment can change dramatically from day tonight. This can cause a lot of stress for the fish and often results in temperature fluctuations that are too high or too low. To minimize these fluctuations, you should keep your tank well-lit at all times and adjust any filtration systems as needed. You can also keep a thermometer in your tank to monitor the temperature and make necessary adjustments.

What Tank Size Do Cory Catfish Need to Keep Temperature Balance?

The aquarium size you use to house your cory catfish is relatively unimportant as long as it has a volume of at least 30 gallons. The recommended tank size for a single male cory catfish is 20 gallons, while a trio will do well in 55 gallon in size aquarium. However, for breeding purposes, you will need an aquarium that measures 75 inches wide by 18 inches deep by 24 inches tall.

Other Significant Care Guide for Cory Catfish

Sand Substrate

While cory catfish do not require any substrate in their tank, they will benefit from having one. The water they swim in and the food they eat float on top of the water surface. In addition, their mouths are in contact with the water, so they do not need to attach themselves to any material that may become damaged by their regular swimming.

Food and Diet

Cory catfish are scavengers, and as such, they require a diet composed mainly of live food. This can include things like small crayfish, cockleshells, and worms. It would help if you also fed them regular doses of healthy aquatic vegetation to help promote good health.


You can keep a single adult male cory catfish with other fish, provided they are of similar size and temperament. However, it is essential to make sure that the tank is large enough to accommodate all occupants. It is also advisable to keep any aggressive fish separate from your cory catfish, as they may fight or peck them if territorial conflicts arise.


Cory catfish can breed in aquariums provided that the water conditions are right. To achieve optimum results, you will need a tank that measures at least 75 inches wide by 18 inches deep and 24 inches tall. The minimum proper temperature for breeding is 78 degrees Fahrenheit, and the pH level should be 7.0 or higher. A good diet for spawning purposes includes live blood worms and mosquito larvae.