Can Australian Pearl Arowana and Cyprichromis Leptosoma Live Together?

Australian Pearl Arowana is a highly aggressive species (9/10), while Cyprichromis Leptosoma is generally mild-mannered (3/10). This notable difference means Australian Pearl Arowana may occasionally assert dominance over Cyprichromis Leptosoma.

Large aggression gap (6 points) between Australian Pearl Arowana and Cyprichromis Leptosoma increases stress risk for the more peaceful fish.

Australian Pearl Arowana and Cyprichromis Leptosoma both frequent the Top (Surface) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.

Worth noting: Australian Pearl Arowana is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 24°C and 28°C. Aim for the midpoint of this range (around 26.0°C) for optimal comfort.

The pH requirements of Australian Pearl Arowana (6–7.5) and Cyprichromis Leptosoma (8–9) do not overlap, making it impossible to satisfy both species simultaneously.

For general hardness, the shared comfort zone is 8–15 dGH. Regular testing will ensure conditions stay within this range.

To house Australian Pearl Arowana and Cyprichromis Leptosoma together, plan for an aquarium of at least 800 litres with a minimum length of 200 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.

Providing a mix of open swimming space and sheltered areas with rocks, driftwood, or plants will keep both species comfortable and allow natural behaviour.

Specific environmental needs for this combination include: Smooth Gravel (Sensitive Barbels), Sand (Sifters). Meeting these requirements will help both species thrive.

Both species do well with moderate (standard) water movement, so a standard filtration setup rated for the tank volume should suffice.

Australian Pearl Arowana and Cyprichromis Leptosoma are the kind of pair that can look acceptable in a shop but become a maintenance problem at home. The main risk is not a single number in the chart; it is the way incompatible behavior, water needs, or pressure on space compounds over time once both fish are established in the same tank.