Can Longnose Gar and Pseudotropheus sp. Kingsizei Live Together?

Longnose Gar is a semi-aggressive species (7/10), while Pseudotropheus sp. Kingsizei is semi-aggressive (8/10). This modest difference means Pseudotropheus sp. Kingsizei may occasionally assert dominance over Longnose Gar.

Both Longnose Gar and Pseudotropheus sp. Kingsizei are highly aggressive, increasing the risk of violent confrontations.

Longnose Gar and Pseudotropheus sp. Kingsizei 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: Longnose Gar is a known jumper, so a tight-fitting lid is essential.

To improve the chances of a peaceful coexistence in this community tank: Provide a significantly larger tank (at least 50% more volume than the minimum) to allow both Longnose Gar and Pseudotropheus sp. Kingsizei to establish separate territories. Add plenty of line-of-sight breaks using driftwood, rocks, and dense planting to reduce territorial confrontations.

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 7.5 and 8.5. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 10–25 dGH. Regular testing will ensure conditions stay within this range.

To house Longnose Gar and Pseudotropheus sp. Kingsizei together, plan for an aquarium of at least 4000 litres with a minimum length of 360 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 - Floating, Smooth Gravel (Sensitive Barbels), Sand (Sifters), Established Algae (Otocinclus). Meeting these requirements will help both species thrive.

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

This pairing usually fails when the tank is treated like a standard mixed community and the caution flags are ignored. Longnose Gar and Pseudotropheus sp. Kingsizei need extra room, more cover, and closer observation during the first few weeks so small aggression, feeding, or territory issues do not snowball into a long-term problem.