Arowana Care Guide: Tank Size, Diet & Tankmates
The Arowana is one of the most iconic and prized fish in the entire freshwater hobby. With its long, sleek body, large mirror-like scales, sweeping fins, and the unmistakable upturned mouth, it glides across the surface like living silver. Often called the "dragon fish," the Arowana is intelligent, interactive, and commands attention as the centerpiece of a very large aquarium. It is a serious commitment, but for the dedicated keeper it is one of the most rewarding fish you can own. We sometimes stock Arowanas here at Tropical Treasures alongside our wider range of freshwater fish. Stock rotates, so if you do not see them listed just message us and we will let you know what is swimming.
Meet the Arowana
Arowanas are large, surface-dwelling predators found in South America, Asia, Australia, and Africa, with the Silver Arowana (Osteoglossum bicirrhosum) being the most widely kept. They are an ancient lineage, sometimes called "living fossils," and can reach 24–36 inches depending on the species, living well over a decade with good care. Juveniles grow quickly, so it is important to plan for their adult size from day one. They share the bold, predatory presence of large cichlids while bringing their own graceful, dragon-like style.
Tank Size and Setup
Arowanas need serious space. A single Silver Arowana needs a minimum of a 250-gallon aquarium as an adult, with a long footprint that gives them room to turn around comfortably. A tight-fitting, heavy lid is essential, as Arowanas are powerful jumpers. Provide open swimming space at the surface, smooth decor and substrate with no sharp edges, and strong filtration to handle their heavy waste load.
Water Parameters and Temperature
Arowanas thrive in warm, clean, stable water. Aim for a temperature of 75–82°F and a pH in the slightly acidic to neutral range of about 6.5–7.5. As with most large fish, consistency and water quality matter most, so keep up with generous regular water changes and reliable filtration. Always acclimate new arrivals slowly.
Feeding Your Arowana
Arowanas are strict carnivores with a hearty appetite. Offer a varied, protein-rich diet of high-quality floating carnivore pellets, along with frozen and live foods such as shrimp, krill, earthworms, and the occasional treat. Variety keeps them healthy and brings out their best color and finnage. Browse our full range of freshwater fish food to keep yours in top condition. Avoid feeding too much fatty or live feeder fish, which can lead to health issues over time.
Tankmates and Temperament
Arowanas are predatory and will eat anything that fits in their mouth, so tankmates must be chosen carefully. They are best kept alone or with large, robust companions in a suitably sized tank. Good options include large catfish, big peaceful cichlids, and other sizable fish that occupy the lower levels of the tank. Avoid small fish and overly aggressive species. Watch closely when introducing any new tankmates.
Is the Arowana Right for You?
The Arowana is best suited to experienced keepers who can provide a very large tank, pristine water, a varied carnivore diet, and a secure lid. They are a long-term commitment in both space and cost. If you are weighing other impressive large fish, our Oscar tank size guide and Uaru care guide are great next reads.
Frequently Asked Questions
How big do Arowanas get? Silver Arowanas commonly reach 24–36 inches in a large aquarium, so a tank of at least 250 gallons with a long footprint is important.
Why do Arowanas jump? In the wild they leap to catch insects and prey above the water, so a heavy, tight-fitting lid is essential to keep them safely in the tank.
Are Arowanas good for beginners? No. Because of their size, dietary needs, jumping ability, and the very large tank they require, Arowanas are best suited to experienced keepers.
Can Arowanas live with other fish? They can, but only with large, robust tankmates that will not fit in their mouth. Small fish will be eaten, so choose companions carefully.