Can Ajamaru Rainbowfish and Altum Angel Live Together?

Ajamaru Rainbowfish is a peaceful species (2/10), while Altum Angel is moderately assertive (5/10). This modest difference means Altum Angel may occasionally assert dominance over Ajamaru Rainbowfish.

Ajamaru Rainbowfish and Altum Angel both frequent the 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: Hyperactive swimmers can stress shy, slow-moving species through constant motion.

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

The safe temperature window for both species falls between 27°C and 28°C. Aim for the midpoint of this range (around 27.5°C) for optimal comfort.

The pH requirements of Ajamaru Rainbowfish (7.2–8.5) and Altum Angel (4.5–6.5) do not overlap, making it impossible to satisfy both species simultaneously.

Hardness requirements are incompatible: Ajamaru Rainbowfish needs 8–20 dGH while Altum Angel requires 1–5 dGH.

To house Ajamaru Rainbowfish and Altum Angel together, plan for an aquarium of at least 400 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 - Densely covered, Sand (Sifters), Driftwood (Digestion/Hiding), Leaf Litter/Blackwater, Plants - Floating. 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.