Can Bullseye Snakehead and Chinese Algae Eater (CAE) Live Together?

Bullseye Snakehead is a highly aggressive species (10/10), while Chinese Algae Eater (CAE) is semi-aggressive (8/10). This modest difference means Bullseye Snakehead may occasionally assert dominance over Chinese Algae Eater (CAE).

Both Bullseye Snakehead and Chinese Algae Eater (CAE) are highly aggressive, increasing the risk of violent confrontations.

Bullseye Snakehead and Chinese Algae Eater (CAE) both frequent the Bottom (Substrate) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.

Additional behavioural considerations to keep in mind: Two territorial species may clash over territory, especially in smaller tanks. Two aggressive species housed together increases risk of fighting.

Worth noting: Bullseye Snakehead 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 Bullseye Snakehead and Chinese Algae Eater (CAE) to establish separate territories. Add plenty of line-of-sight breaks using driftwood, rocks, and dense planting to reduce territorial confrontations. A larger aquarium with ample hiding spots can help diffuse aggression and give the less dominant fish space to retreat.

The safe temperature window for both species falls between 22°C and 28°C. Aim for the midpoint of this range (around 25.0°C) for optimal comfort.

Both fish can tolerate a pH between 6 and 8. 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 Bullseye Snakehead and Chinese Algae Eater (CAE) together, plan for an aquarium of at least 5000 litres with a minimum length of 350 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: Driftwood (Digestion/Hiding), Plants - Floating, Smooth Gravel (Sensitive Barbels). Meeting these requirements will help both species thrive.

Bullseye Snakehead prefers Low (Still Water) flow while Chinese Algae Eater (CAE) needs High (River/Stream) flow. Consider positioning filter outlets and using baffles to create zones of different current intensity within the same tank.

This pairing usually fails when the tank is treated like a standard mixed community and the caution flags are ignored. Bullseye Snakehead and Chinese Algae Eater (CAE) 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.