Can Celestial Pearl Danio (Galaxy Rasbora) and Twig Catfish (Farlowella) Live Together?

Celestial Pearl Danio (Galaxy Rasbora) is a peaceful species (2/10), while Twig Catfish (Farlowella) is peaceful (1/10). This modest difference means Celestial Pearl Danio (Galaxy Rasbora) may occasionally assert dominance over Twig Catfish (Farlowella).

Celestial Pearl Danio (Galaxy Rasbora) and Twig Catfish (Farlowella) both frequent the Middle (Open Water) and 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.

The safe temperature window for both species falls between 23°C and 26°C. Aim for the midpoint of this range (around 24.5°C) for optimal comfort.

Both fish can tolerate a pH between 6.5 and 7.2. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 5–10 dGH. Regular testing will ensure conditions stay within this range. An aquarium test kit is recommended for monitoring.

To house Celestial Pearl Danio (Galaxy Rasbora) and Twig Catfish (Farlowella) together, plan for an aquarium of at least 132 litres with a minimum length of 80 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.

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

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