Can Demasoni Cichlid (Mbuna) and Geophagus Orange Head Tapajos Live Together?

Demasoni Cichlid (Mbuna) is a highly aggressive species (9/10), while Geophagus Orange Head Tapajos is generally mild-mannered (3/10). This notable difference means Demasoni Cichlid (Mbuna) may occasionally assert dominance over Geophagus Orange Head Tapajos.

Large aggression gap (6 points) between Demasoni Cichlid (Mbuna) and Geophagus Orange Head Tapajos increases stress risk for the more peaceful fish.

Demasoni Cichlid (Mbuna) and Geophagus Orange Head Tapajos 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.

The safe temperature window for both species falls between 26°C and 28°C. Aim for the midpoint of this range (around 27.0°C) for optimal comfort.

The pH requirements of Demasoni Cichlid (Mbuna) (7.6–8.6) and Geophagus Orange Head Tapajos (5.5–7.5) do not overlap, making it impossible to satisfy both species simultaneously.

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

To house Demasoni Cichlid (Mbuna) and Geophagus Orange Head Tapajos together, plan for an aquarium of at least 280 litres with a minimum length of 120 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.

Providing a mix of open swimming space and sheltered areas with rocks, driftwood, or plants will keep both species comfortable and allow natural behaviour.

Specific environmental needs for this combination include: Sand (Sifters), Established Algae (Otocinclus), Driftwood (Digestion/Hiding), Smooth Gravel (Sensitive Barbels). 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.

Demasoni Cichlid (Mbuna) and Geophagus Orange Head Tapajos are the kind of pair that can look acceptable in a shop but become a maintenance problem at home. The main risk is not a single number in the chart; it is the way incompatible behavior, water needs, or pressure on space compounds over time once both fish are established in the same tank.