Can Demasoni Cichlid (Mbuna) and Fahaka Puffer Live Together?

Demasoni Cichlid (Mbuna) is a highly aggressive species (9/10), while Fahaka Puffer is highly aggressive (10/10). This modest difference means Fahaka Puffer may occasionally assert dominance over Demasoni Cichlid (Mbuna).

Both Demasoni Cichlid (Mbuna) and Fahaka Puffer are highly aggressive, increasing the risk of violent confrontations.

Demasoni Cichlid (Mbuna) and Fahaka Puffer both frequent the Bottom (Substrate) and 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.

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.

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 Demasoni Cichlid (Mbuna) and Fahaka Puffer 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 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 7.6 and 8.2. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 10–15 dGH. Regular testing will ensure conditions stay within this range.

To house Demasoni Cichlid (Mbuna) and Fahaka Puffer together, plan for an aquarium of at least 540 litres with a minimum length of 150 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.

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), Established Algae (Otocinclus), Shells (Breeding/Hiding). Meeting these requirements will help both species thrive.

Both species do well with high (river/stream) water movement, so a standard filtration setup rated for the tank volume should suffice.