Can Lake Eacham Rainbowfish and Pseudotropheus Acei Live Together?

Lake Eacham Rainbowfish is a peaceful species (2/10), while Pseudotropheus Acei is generally mild-mannered (4/10). This modest difference means Pseudotropheus Acei may occasionally assert dominance over Lake Eacham Rainbowfish.

Lake Eacham Rainbowfish and Pseudotropheus Acei both frequent the Top (Surface) 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.

Worth noting: Lake Eacham Rainbowfish is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 24°C and 27°C. Aim for the midpoint of this range (around 25.5°C) for optimal comfort.

The pH requirements of Lake Eacham Rainbowfish (6.8–7.6) and Pseudotropheus Acei (7.8–8.6) do not overlap, making it impossible to satisfy both species simultaneously.

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

To house Lake Eacham Rainbowfish and Pseudotropheus Acei together, plan for an aquarium of at least 200 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: Plants - lighly covered, Sand (Sifters), Smooth Gravel (Sensitive Barbels), Driftwood (Digestion/Hiding). Meeting these requirements will help both species thrive.

Note a potential conflict in setup requirements: Pseudotropheus Acei is a plant destroyer, which conflicts with Lake Eacham Rainbowfish's requirement for live plants. Compromise where possible or prioritise the more critical need.

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

Lake Eacham Rainbowfish and Pseudotropheus Acei 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.