How To Set Temperature on Top Fin Heater?

Water temperature plays a crucial role in the development of your fish. Not all fish can live and grow at the same temperature.  

Maintaining that certain temperature manually is neither easy nor possible. Top fin heaters are one of the finest aquarium heaters which you can use to maintain the tank temperature. 

The heater comes with a 78°F preset. If it’s suitable for your species of fish then you just have to turn it on. Adjusting the temperature on Top Fin is also user-friendly.

However, I will talk about how to set temperature on top fin heater in this article below. 

Why Aquarium Temperature is Important?

If the temperature of the aquarium is not right, the whole environment of the water can be messed up. It can badly affect the fish and many problems can occur.

Water oxygenation level changes at different temperatures. The death of necessary bacteria, a chemical imbalance in the tank, and poor metabolism in fish all are side effects of the improper temperature of the water. 

How To Set Temperature on Top Fin Heater?

The top fin aquarium heater is one of the most reliable heaters you can find on the market. It is made of shatter-resistant quartz glass. Not only it comes with the value for money but also it is easy to use. 

Here are some easy steps you can follow and set the temperature for your aquarium:

  • You will find two suction cups with the heater. It is used to attach the heater to the aquarium glass.  
  • You have to submerge the heater entirely into the water as it is a submersible heater. Be careful, the heater should not touch any other surface inside the aquarium. 
  • You have to reset the heat according to the need of your tank. Because the heater comes with a preset of 78 degrees Fahrenheit.
  • The top fin heater ensures even heat distribution throughout the aquarium. But it is advisable to set it near the air pump or filter’s flow.
  • Give the heater 10 to 15 minutes so that it can adjust to the water condition of the tank. After that, you can turn it on. 
  • When the water will reach the desired temperature, the heater will turn off automatically. 
  • To ensure the temperature, use a reliable thermometer and check the water temperature.  

How Fish React to Temperature Changes?

As the temperature rise, the metabolic rate and activity of the fish will increase. Both indicate they will need more oxygen to thrive. 

On the other hand, when the water temperature rises, it can hold less and less oxygen than usual. It creates a catastrophe for the aquatic creatures. 

You also have to keep in mind that, not all the fish can live at the same temperature. Different kinds of water also react differently to temperature change. 

To be safe, a good quality water thermometer can help you to maintain the heat.  

Ideal Temperature of the Tank 

The ideal temperature of the tank depends on what kind of fish you are keeping inside it. But it should not be above 86 degrees Fahrenheit and 30 degrees Celsius for weeks. 

It can harm most aquarium fish. But the ideal temperature of any specific tank solely depends on the species of that fish.  

Tropical Fish Temperature Chart 

Fish Species Temperature (Celsius)
Fancy Guppies 74 – 82 degrees Fahrenheit.
Platies 68 – 82 degrees Fahrenheit
Swordtails 72 – 79 degrees Fahrenheit.
Neon Tetras 70 – 81 degrees Fahrenheit
Corydoras 60 – 75 degrees Fahrenheit
Mollies 75 to 80 degrees Fahrenheit
Angelfish 80 degrees Fahrenheit
Goldfish 68-74 degrees Fahrenheit
Tetras 75-80 degrees Fahrenheit
Barbs 68-79 degrees Fahrenheit
Betta 78-80 degrees Fahrenheit
Cichlids 78-82 degrees Fahrenheit

Frequently Asked Questions (FAQs)

Do I need an aquarium heater in the summer? 

A Heater can keep the water temperature stable which is healthy for the fish. You can check and regulate the temperature as per need. 

Should I leave the heater on all the time?

Yes, you can leave the heater on all the time. The top fin heater turns off automatically when the water is at the desired temperature. 

Do aquarium heaters use a lot of electricity?

If your tank is heated at 72F, it will approximately consume 110 kWh per year.

Should I turn off the aquarium heater at night?

You should never turn it off. Regulate the temperature as per the need. 


Setting or regulating the temperature on the top fin aquarium is not a hard job to do. The heater is user-friendly and anyone can set it according to the species of fish you have. 

Installing a heater for the fish is a healthy way to maintain the aquatic environment inside the water and keep the pets healthy. Frequent changes in water temperature can harm the fish in the long run. 

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Arif H Fahim

Welcome to PetFishTank! My name is Arif. I make an effort to publish educational articles using my many years of expertise as a fish owner.

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