Can Ajamaru Rainbowfish and Pangasius nasutus (Long-Nosed Pangasius) Live Together?

Ajamaru Rainbowfish is a peaceful species (2/10), while Pangasius nasutus (Long-Nosed Pangasius) is generally mild-mannered (4/10). This modest difference means Pangasius nasutus (Long-Nosed Pangasius) may occasionally assert dominance over Ajamaru Rainbowfish.

Ajamaru Rainbowfish and Pangasius nasutus (Long-Nosed Pangasius) 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.

Worth noting: Ajamaru Rainbowfish 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.

Both fish can tolerate a pH between 7.2 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 8–15 dGH. Regular testing will ensure conditions stay within this range.

To house Ajamaru Rainbowfish and Pangasius nasutus (Long-Nosed Pangasius) together, plan for an aquarium of at least 4000 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.

Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.

Specific environmental needs for this combination include: Plants - Densely covered, 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.