Silver Arowana

The Silver Arowana, scientifically known as Osteoglossum bicirrhosum, belongs to the Oddballs family group. Adults reach a maximum size of approximately 100 cm and have a compressed body shape with a fast growth rate. Classified as semi-aggressive, this species primarily occupies the surface zone of the aquarium and produces a extreme level of biological waste.

To thrive, the Silver Arowana requires a freshwater only aquarium with a minimum volume of 1000 litres and a tank length of at least 240 cm. Water temperature should be maintained between 24°C and 30°C, with a pH range of 6–7.5 and a general hardness of 1–12 dGH. A moderate water flow is preferred.

The Silver Arowana is a rewarding species to keep, provided its core environmental needs are met. This species is available in 3 varieties: Standard (Adult), Juvenile (Grow-out), and Albino / Platinum (Adult). Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.

When setting up an aquarium for the Silver Arowana, a moderate water flow best suits their natural preferences. Because this species occupies the surface zone, the aquarium layout should prioritise adequate surface area with floating cover to make them feel secure near the waterline. Useful additions include smooth gravel or rounded substrate to protect their sensitive barbels. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper.

Classified as semi-aggressive, the Silver Arowana is best housed alone, as they do not tolerate others of their kind in confined spaces. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten, territorial behaviour may cause issues if hiding spots or floor space are limited, and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the surface zone can help reduce competition and territorial overlap.

Silver Arowana is best for a fishkeeper who wants a species that can settle into a calmer community setup and can provide someone who understands its individual space requirements. It makes the most sense for a hobbyist who will actually build around its needs, especially smooth gravel.

The most common mistake is buying Silver Arowana for looks first and only later discovering how its adult size, behavior, or bioload changes the whole tank plan. Another frequent problem is forcing it into an over-busy community when it would do better with more room or more deliberate tankmate choices.