Can Freshwater Shark (Wallago) and Neon Green Rasbora (Kubotai) Live Together?

Freshwater Shark (Wallago) is a highly aggressive species (10/10), while Neon Green Rasbora (Kubotai) is peaceful (1/10). This notable difference means Freshwater Shark (Wallago) may occasionally assert dominance over Neon Green Rasbora (Kubotai).

Large aggression gap (9 points) between Freshwater Shark (Wallago) and Neon Green Rasbora (Kubotai) increases stress risk for the more peaceful fish.

Freshwater Shark (Wallago) and Neon Green Rasbora (Kubotai) both frequent the Middle (Open Water) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.

There is a critical concern: the Piscivore (Eats small/nano fish) behaviour of one fish directly conflicts with the Nano / Bite-sized (Predation Risk) trait of the other — piscivorous fish will prey on nano-sized tank mates..

Worth noting: Freshwater Shark (Wallago) is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 20°C and 27°C. Aim for the midpoint of this range (around 23.5°C) for optimal comfort.

Both fish can tolerate a pH between 6 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 2–10 dGH. Regular testing will ensure conditions stay within this range.

To house Freshwater Shark (Wallago) and Neon Green Rasbora (Kubotai) together, plan for an aquarium of at least 5500 litres with a minimum length of 300 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: Sand (Sifters), Smooth Gravel (Sensitive Barbels), Plants - Densely covered, Plants - lighly covered, Leaf Litter/Blackwater. 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.

Freshwater Shark (Wallago) and Neon Green Rasbora (Kubotai) 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.