Can Longnose Gar and Silver Datnoid (Silver Tigerfish) Live Together?

Longnose Gar is a semi-aggressive species (7/10), while Silver Datnoid (Silver Tigerfish) is moderately assertive (6/10). This modest difference means Longnose Gar may occasionally assert dominance over Silver Datnoid (Silver Tigerfish).

Longnose Gar and Silver Datnoid (Silver Tigerfish) 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.

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 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 Silver Datnoid (Silver Tigerfish) 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), Driftwood (Digestion/Hiding), Sand (Sifters). 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.