Can Congo Bichir and Emperor Snakehead Live Together?

Congo Bichir is a semi-aggressive species (7/10), while Emperor Snakehead is highly aggressive (9/10). This modest difference means Emperor Snakehead may occasionally assert dominance over Congo Bichir.

Both Congo Bichir and Emperor Snakehead are highly aggressive, increasing the risk of violent confrontations.

In terms of spatial distribution, Congo Bichir prefers the Bottom (Substrate) zone, whereas Emperor Snakehead occupies the Middle (Open Water) and Top (Surface) zones. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.

Worth noting: Congo Bichir is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Congo Bichir 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 Congo Bichir and Emperor Snakehead 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 30°C. Aim for the midpoint of this range (around 27.0°C) for optimal comfort.

Both fish can tolerate a pH between 6.5 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 5–15 dGH. Regular testing will ensure conditions stay within this range.

To house Congo Bichir and Emperor Snakehead 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.

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: Sand (Sifters), Smooth Gravel (Sensitive Barbels), Driftwood (Digestion/Hiding), Plants - Floating, 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.