7 Myths About Arowana That Owners Still Believe

Owning an Arowana can be exciting, yet many new and seasoned owners find themselves unsure about what these fish truly need. Their unique appearance and behavior often lead to mixed advice and popular assumptions.

Several myths about Arowana persist among owners, including beliefs about tank size, diet restrictions, aggression, and longevity. These misconceptions can affect care practices, leading to unnecessary stress for both the fish and the owner, requiring clarification through accurate information.

Knowing which beliefs are myths can improve your Arowana’s well-being and help you enjoy the ownership experience more confidently.

Myth 1: Arowanas Only Need Small Tanks

Many people assume that Arowanas can thrive in small tanks because they grow slowly at first. In reality, these fish can reach up to three feet in length, making tank size crucial. A small tank limits their movement, stresses the fish, and can stunt growth. Proper filtration and water circulation are also harder to maintain in confined spaces. Owners often underestimate how much space is needed for these elegant swimmers to display natural behaviors. Tank width and height matter just as much as length, ensuring they can turn comfortably without bumping into decorations or the glass. Even juvenile Arowanas benefit from larger setups, preventing aggression and injuries. Tank decorations should be minimal to allow free swimming, but hiding spots are important to reduce stress. Feeding, water quality, and general health all improve when the fish has adequate space. Regular maintenance becomes easier in a well-sized tank, making care less stressful for the owner.

Providing an appropriately sized tank ensures Arowanas grow healthy and display natural behavior, reducing stress and health issues associated with confined spaces.

Giving your Arowana room to move freely will make a noticeable difference in its activity and overall health.

Myth 2: Arowanas Can Eat Only Live Food

Arowanas are often thought to survive exclusively on live food, like insects or small fish. While they enjoy live meals, they can adapt to high-quality pellets, frozen foods, and occasional treats. Relying solely on live prey increases risk of disease and parasites. Balanced nutrition supports growth, color, and immunity, making pellet diets a safe and convenient option. Mixing food types ensures they receive necessary nutrients without overfeeding or nutritional gaps. Owners can gradually introduce alternative foods, observing acceptance and digestive response. Variety prevents boredom and encourages natural foraging instincts. Over time, many Arowanas will readily accept non-live options, making daily care more practical.

Feeding live prey exclusively is unnecessary and can compromise health, as Arowanas benefit from varied, balanced diets.

Providing a mix of pellets, frozen foods, and occasional live meals ensures proper nutrition without risking illness. Transitioning from live food to prepared diets should be gradual to avoid stress, with careful observation of acceptance. This approach supports strong growth, bright coloration, and a healthier immune system. Consistent feeding schedules and monitoring portion sizes help prevent obesity or digestive problems. Using high-quality pellet foods enriched with vitamins and minerals ensures the fish gets essential nutrients while reducing dependence on live prey. Owners also find maintenance easier, as frozen and pellet foods are cleaner and easier to store. Treats like crickets or shrimp can be added occasionally to encourage natural hunting behaviors and provide enrichment, but they should not form the core diet. By balancing convenience and health, Arowanas thrive under realistic, safe feeding practices.

Myth 3: Arowanas Are Always Aggressive

Arowanas are not naturally aggressive toward all fish. Aggression depends on tank size, companions, and environment. Properly arranged tanks reduce conflict, and many Arowanas coexist peacefully with other species.

Aggression often appears when space is limited or tank mates are small and fast. Large, sturdy fish as companions usually fare better. Arowanas display territorial behavior, but with enough room, this is manageable. Stress and poor conditions can worsen aggression, while calm surroundings and consistent routines help maintain a balanced temperament. Observation and careful planning prevent incidents and promote harmony.

Feeding schedules also influence behavior. Hungry or overfed fish may show more irritability. Gradually introducing tank mates and monitoring interactions can reduce sudden attacks. Understanding individual personality matters, as some Arowanas are naturally more active or assertive. Separating incompatible fish early prevents injuries. Environmental enrichment, like floating plants or minimal obstacles, can redirect attention and reduce boredom-driven aggression. Socializing over time often leads to calmer interactions, and consistent maintenance ensures health, which directly affects temperament. Overall, aggression is situational, not constant.

Myth 4: Arowanas Don’t Need Regular Water Changes

Even strong, healthy Arowanas require regular water changes. Skipping them can lead to toxic buildup, poor oxygen levels, and stress, regardless of filtration.

Consistent water changes maintain chemical balance, reduce ammonia and nitrite levels, and prevent algae overgrowth. Arowanas are sensitive to sudden changes, so gradual replacement with conditioned water is essential. Weekly partial changes are more effective than occasional large ones. Monitoring water parameters supports stable conditions and improves fish longevity. Proper technique also avoids temperature shocks, which can weaken immunity.

Neglecting water changes can cause long-term health problems, including weakened immune response, stunted growth, and vulnerability to disease. Even the best filtration systems cannot fully replace fresh water. Observing color, behavior, and appetite helps identify early signs of poor water quality. Combining regular cleaning, careful feeding, and monitoring ensures optimal conditions. Using dechlorinated water at matching temperature prevents stress. Adjusting frequency based on tank size and population keeps parameters stable. Maintaining water quality is not optional; it directly impacts overall health, activity level, and lifespan.

Myth 5: Arowanas Can Live Without Proper Lighting

Arowanas do not thrive in complete darkness or constant bright light. Moderate lighting supports natural behavior, feeding patterns, and coloration.

Too little or too much light stresses the fish and can disrupt sleep cycles. Balanced lighting helps maintain a natural day-night rhythm, which is essential for health and activity.

Myth 6: Arowanas Do Not Require Supplements

While a balanced diet is important, Arowanas benefit from occasional vitamin and mineral supplements. Supplements help maintain strong scales, vibrant color, and overall immunity. Regular feeding alone may not meet all nutritional needs, especially in captive environments.

Myth 7: Arowanas Can Adapt to Any Water Type

Arowanas are sensitive to pH, hardness, and temperature. Drastic changes in water type can cause stress, illness, or death. Consistent water conditions suited to their species ensure long-term health and proper development.

FAQ

How often should I change the water in my Arowana tank?
Water changes should be done at least once a week, with about 20–30% of the water replaced each time. Larger tanks or heavily stocked setups may require slightly more frequent changes. Always use dechlorinated water at the same temperature to avoid stress or shock.

Can Arowanas live with other fish?
Yes, but tank mates must be carefully chosen. Avoid small, fast-moving fish that may trigger hunting instincts. Larger, peaceful species are usually safer companions. Make sure the tank is spacious enough so territorial behavior is minimized, and monitor interactions regularly.

What should I feed my Arowana?
Arowanas eat a mix of high-quality pellets, frozen foods, and occasional live meals. Variety ensures balanced nutrition and supports healthy growth and coloration. Avoid feeding exclusively live prey, as it can introduce parasites or diseases. Feeding should occur once or twice daily in amounts the fish can consume quickly.

How big should an Arowana tank be?
A tank should be at least 250 gallons for a fully grown Arowana, though juveniles can start smaller. Length and width are important for turning and swimming comfortably. Adequate filtration and water flow are essential to maintain water quality in larger setups.

Do Arowanas need supplements?
Supplements like vitamins and minerals can support immune health, scale strength, and coloration, especially in captive fish. High-quality pellets often provide basic nutrients, but occasional additions are beneficial. Be careful not to over-supplement, as this can cause digestive or health issues.

How do I reduce aggression in my Arowana?
Provide enough space, avoid overcrowding, and choose compatible tank mates. Feeding schedules and environmental enrichment can also help. Aggression often decreases as the fish adjusts to its surroundings, but individual temperament varies. Observation is key to preventing injuries.

What is the ideal water temperature and pH for Arowanas?
Arowanas thrive in water between 75–82°F (24–28°C) and a slightly acidic to neutral pH, around 6.5–7.5. Sudden changes in temperature or pH can cause stress or illness, so gradual adjustments are important. Stable conditions improve growth, appetite, and overall health.

Why is my Arowana losing color?
Color fading often indicates poor nutrition, inadequate lighting, or stress. Ensure a varied diet, proper lighting schedule, and stable water parameters. Check for illnesses or parasites, as these can also affect pigmentation. Maintaining consistent care is essential for vibrant coloration.

How can I prevent disease in my Arowana?
Regular water changes, proper feeding, and monitoring for signs of illness are essential. Quarantine new fish, avoid overfeeding, and maintain a clean environment. Prompt treatment at the first sign of disease improves recovery chances and prevents spread to other tank inhabitants.

What should I do if my Arowana jumps out of the tank?
Covering the tank with a secure lid prevents accidents. If the fish jumps, handle it carefully with wet hands or a soft net and return it to water immediately. Stress and injury can occur, so prevent jumping by maintaining calm water conditions and avoiding sudden movements near the tank.

How long do Arowanas typically live?
With proper care, Arowanas can live 10–15 years or longer. Lifespan depends on diet, water quality, tank size, and stress levels. Consistent, attentive care significantly improves longevity, ensuring your fish remains healthy and active for many years.

Can Arowanas live in tap water?
Tap water is usable if properly treated to remove chlorine, chloramines, and heavy metals. Testing water parameters regularly ensures safe pH and hardness levels. Untreated tap water can harm sensitive Arowanas, so always prepare water before adding it to the tank.

How do I acclimate a new Arowana?
Float the bag in the tank for 15–20 minutes to match temperatures. Gradually add small amounts of tank water to the bag over 30–60 minutes. Release the fish gently into the tank, avoiding sudden changes in water chemistry. This reduces stress and prevents shock.

Why is my Arowana refusing food?
Refusal to eat may indicate stress, illness, poor water quality, or sudden changes in environment. Check water parameters, tank conditions, and health. Offering a variety of foods can help stimulate appetite, but prolonged refusal may require veterinary attention.

How can I encourage natural behavior in my Arowana?
Provide enough swimming space, minimal obstacles, and occasional enrichment like floating plants. A consistent feeding schedule and proper lighting encourage activity. Avoid overcrowding and unnecessary disturbances, as calm surroundings allow natural behaviors to emerge.

This FAQ section covers common concerns and practical solutions for keeping Arowanas healthy, active, and thriving in captivity.

Arowanas are beautiful and fascinating fish, but caring for them requires understanding and attention. Many myths about their behavior, diet, and environment can make ownership confusing. Believing these misconceptions can unintentionally harm the fish or make care more difficult. Owners often think that Arowanas can survive in small tanks, eat only live food, or are always aggressive. These ideas are not true and can lead to stress for both the fish and the owner. Learning what is accurate and what is false helps create a healthier environment and a better experience for everyone involved. Recognizing that each Arowana has its own personality and needs is an important part of responsible care.

Proper tank size, balanced nutrition, and stable water conditions are essential for keeping an Arowana healthy. Large tanks allow them to swim freely and display natural behaviors, which reduces stress and aggression. Feeding a mix of pellets, frozen foods, and occasional live meals ensures proper nutrition without risking disease from live prey. Regular water changes, monitoring of temperature, pH, and hardness, and consistent lighting all contribute to the fish’s well-being. These factors might seem overwhelming at first, but following basic guidelines can make daily care manageable. Over time, observing how the fish reacts to its environment helps owners adjust care practices and prevent issues before they become serious.

Understanding these key points allows owners to enjoy Arowanas without being misled by myths. It is important to stay informed, plan carefully, and pay attention to the fish’s behavior. By providing space, nutrition, and proper maintenance, owners can support their Arowana’s growth, coloration, and overall health. Avoiding common misconceptions prevents unnecessary stress and promotes a long, healthy life for the fish. While Arowanas require commitment and attention, following accurate care practices ensures a rewarding and satisfying experience. The effort put into learning and maintaining proper care pays off as the fish thrives and shows its full potential in a well-prepared environment.