Arowana Water Temperature, Tank Conditions & More

Arowana fish swimming in a tropical aquarium

Arowana Water Temperature, Tank Conditions & More

Arowana fish, also known as “dragon fish” or “water monkey,” are magnificent creatures that captivate fish enthusiasts around the world. Their unique appearance, vibrant colors, and graceful movements make them highly sought after for aquariums. However, to ensure the health and well-being of these exquisite fish, it is crucial to provide them with appropriate tank conditions, particularly maintaining the correct water temperature. In this article, we will explore the significance of water temperature for Arowana fish and discuss essential considerations for creating an optimal environment.

Understanding Arowana Fish

Before delving into the intricacies of water temperature, let’s briefly familiarize ourselves with Arowana fish. Native to the rivers and freshwater habitats of Southeast Asia, Arowanas are known for their long bodies, large scales, and impressive leaps. They belong to the Osteoglossidae family and come in several species, including the Silver Arowana, Asian Arowana, and Black Arowana.

Arowana fish swimming in a tropical aquarium
Monitoring water temperature is crucial for the health of Arowana fish.

Importance of Maintaining Proper Water Temperature

Maintaining the proper water temperature in an Arowana fish tank is crucial for the overall health, growth, and behavior of these magnificent creatures. Arowanas are tropical fish, accustomed to warm waters in their natural habitats. Therefore, replicating their preferred temperature range in captivity is vital for their well-being.

Optimal Water Temperature for Arowana Fish

Natural Habitat of Arowana Fish

In their natural habitats, Arowana fish thrive in warm, slow-moving freshwater environments such as rivers, lakes, and swamps. These areas typically have temperatures ranging from 75°F (24°C) to 86°F (30°C). Arowanas are native to regions with a tropical climate, where temperatures remain relatively stable throughout the year.

Ideal Water Temperature Range

To create a suitable environment for your Arowana fish, it is recommended to maintain a water temperature between 78°F (25°C) and 82°F (28°C). This temperature range closely mimics their natural habitat and promotes their physical and mental well-being. Consistency is key, as sudden fluctuations in temperature can stress the fish and compromise their health.

Effects of Incorrect Water Temperature

If the water temperature in an Arowana fish tank is too low or too high, it can have detrimental effects on their health. Low temperatures can slow down their metabolism, leading to reduced appetite and weakened immune systems. On the other hand, excessively high temperatures can cause stress, oxygen depletion, and even death. It is essential to monitor and maintain the water temperature within the optimal range to ensure the longevity of your Arowana fish.

Setting Up the Arowana Fish Tank

Creating an ideal habitat for your Arowana fish involves more than just maintaining the right water temperature. Here are some crucial factors to consider when setting up their tank:

Choosing the Right Size Tank

Arowanas are large fish that require ample swimming space. It is recommended to provide them with a tank that is at least 180 gallons (680 liters) in capacity. A long and wide tank is preferable over a tall one, as Arowanas are surface-dwelling fish and need space to move horizontally. 170 Gallon White Fish Aquarium

Aquarium Heater and Thermometer

To regulate the water temperature effectively, invest in a high-quality aquarium heater and a reliable thermometer. Submersible heaters are commonly used for Arowana tanks, and they should be capable of maintaining the desired temperature range. A separate thermometer will allow you to monitor the water temperature accurately.

Filtration System

A robust filtration system is essential for maintaining optimal water quality. Arowanas produce a significant amount of waste, and efficient filtration will remove harmful substances and provide clean, oxygenated water. Choose a filter that suits the size of your tank and consider adding additional biological filtration to promote a healthy nitrogen cycle.

Monitoring and Adjusting Water Temperature

Regular monitoring of the water temperature is crucial to ensure it remains within the desired range. Here are some key considerations:

Regular Temperature Checks

Use a reliable thermometer to measure the water temperature daily. Check the temperature at different times of the day to detect any fluctuations. If you notice significant deviations from the ideal range, immediate action may be required.

Adjusting the Water Temperature

If the water temperature in the tank is too high or too low, it is essential to take corrective measures promptly. To increase the temperature, adjust the heater accordingly or consider using a higher wattage heater. Conversely, if the temperature is too high, you can either reduce the heater’s temperature setting or use a fan or chiller to cool the water.

Other Tank Conditions for Arowana Fish

While water temperature is a critical factor, other tank conditions also contribute to the well-being of Arowana fish. Consider the following aspects:

Water pH Level

Arowanas prefer slightly acidic to neutral water conditions. Aim for a pH level between 6.5 and 7.5. Regularly test the pH level using a reliable aquarium test kit and make adjustments if necessary.

Water Hardness

Maintaining the appropriate water hardness is crucial for Arowana fish. Aim for a moderate hardness level, usually within the range of 2 to 15 dGH (degrees of general hardness). This range will help support their growth and overall health.

Lighting and Substrate

Provide a suitable lighting setup for your Arowana tank. Arowanas prefer subdued lighting, so use low-intensity or diffused lighting systems. Additionally, choose a substrate that is easy to clean and does not pose any harm to the fish.

Maintaining Water Quality

Besides temperature and tank conditions, water quality plays a vital role in the health of Arowana fish. Consider the following practices:

Regular Water Changes

Perform regular water changes to maintain optimal water quality. Replace approximately 10% to 15% of the tank water weekly or as needed. This helps remove accumulated toxins and keeps the water parameters stable.

Proper Filtration

Ensure your filtration system is functioning correctly and provides adequate mechanical, chemical, and biological filtration. Clean or replace filter media as recommended by the manufacturer to prevent clogging and ensure optimal filtration efficiency. Where to buy Arowana fish near me

Avoid Overstocking

Arowanas are solitary fish that prefer their space. Avoid overstocking the tank, as it can lead to increased waste production, poor water quality, and aggression among fish. Provide ample swimming space and keep only compatible tankmates, if any.

Feeding and Care Tips

Proper nutrition and care are essential for the well-being of Arowana fish. Consider the following tips:

Arowana Diet

Provide a balanced diet consisting of high-quality pellets, live or frozen foods, and occasional treats. Arowanas are carnivorous and thrive on a protein-rich diet. Offer a variety of food to ensure they receive essential nutrients. Arowana Fish Feeding Habits and Nutritional Requirements

Feeding Frequency

Feed your Arowana fish small portions two to three times a day. Arowanas are voracious eaters but avoid overfeeding, as it can lead to obesity and related health issues. Monitor their feeding behavior and adjust the portion size accordingly.

Care and Handling

Handle your Arowana fish with care and minimize unnecessary stress. Avoid sudden movements or loud noises near the tank. Ensure the tank is securely covered to prevent the fish from jumping out, as Arowanas are known for their exceptional leaping ability.

Common Mistakes to Avoid

To ensure the well-being of your Arowana fish, avoid the following common mistakes:

Rapid Temperature Changes

Avoid sudden and drastic changes in water temperature. Arowanas are sensitive to temperature fluctuations, and rapid changes can stress and harm them. Gradual adjustments are key to maintaining a stable and comfortable environment. Where to Buy Arowana Fish for Sale: Your Ultimate Guide


Overfeeding can lead to various health issues, including obesity, poor water quality, and digestive problems. Follow a feeding schedule and monitor your Arowana’s appetite and body condition to avoid overfeeding.

Neglecting Water Quality

Poor water quality can have severe consequences for Arowana fish. Neglecting regular water changes, inadequate filtration, and improper maintenance can lead to ammonia buildup, bacterial infections, and compromised health. Stay diligent in maintaining optimal water conditions.


Properly maintaining the water temperature and other tank conditions is crucial for the health and well-being of Arowana fish. By replicating their natural habitat and providing optimal water temperature, you can ensure that your Arowanas thrive in your aquarium. Regular monitoring, appropriate tank setup, and adherence to feeding and care guidelines will contribute to the longevity and beauty of these magnificent fish.


Q1: Can I keep multiple Arowana fish in the same tank?

A1: Arowanas are solitary fish and generally prefer to be the only Arowana in the tank. Keeping multiple Arowanas together can lead to territorial disputes and aggression.

Q2: How often should I clean the tank?

A2: Regular maintenance, including water changes and cleaning, is essential. Perform partial water changes of 10% to 15% weekly and clean the tank and filter components as needed.

Q3: Can Arowanas live with other fish species?

A3: While Arowanas are generally best kept alone, some large, peaceful tankmates can coexist with them. Choose compatible fish that share similar water conditions and temperament.

Q4: What should I do if my Arowana fish becomes sick?

A4: If you notice signs of illness in your Arowana, such as loss of appetite, discoloration, or abnormal behavior, consult a qualified aquatic veterinarian

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