Can Celestial Pearl Danio (Galaxy Rasbora) and Emerald Dwarf Danio Live Together?

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

Celestial Pearl Danio (Galaxy Rasbora) and Emerald Dwarf Danio 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.

Worth noting: Emerald Dwarf Danio is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 20°C and 24°C. Aim for the midpoint of this range (around 22.0°C) for optimal comfort.

Both fish can tolerate a pH between 7 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 8–15 dGH. Regular testing will ensure conditions stay within this range.

To house Celestial Pearl Danio (Galaxy Rasbora) and Emerald Dwarf Danio together, plan for an aquarium of at least 38 litres with a minimum length of 45 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. 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.