Can Celestial Pearl Danio (Galaxy Rasbora) and Fairy Cichlid (Brichardi) Live Together?
Celestial Pearl Danio (Galaxy Rasbora) and Fairy Cichlid (Brichardi) are not recommended as tank mates due to conflicting pH requirements. Housing these species together is likely to result in stress, health problems, or direct harm to one or both fish.
At a Glance
Behaviour & Temperament
Celestial Pearl Danio (Galaxy Rasbora) is a peaceful species (2/10), while Fairy Cichlid (Brichardi) is semi-aggressive (8/10). This notable difference means Fairy Cichlid (Brichardi) may occasionally assert dominance over Celestial Pearl Danio (Galaxy Rasbora).
Large aggression gap (6 points) between Celestial Pearl Danio (Galaxy Rasbora) and Fairy Cichlid (Brichardi) increases stress risk for the more peaceful fish.
Celestial Pearl Danio (Galaxy Rasbora) and Fairy Cichlid (Brichardi) 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.
Additional behavioural considerations to keep in mind: Aggressive fish may bully and stress shy, slow-moving species.
Water Parameters
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.
The pH requirements of Celestial Pearl Danio (Galaxy Rasbora) (6.5–7.5) and Fairy Cichlid (Brichardi) (8–9) 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. An aquarium test kit is recommended for monitoring.
Tank Setup
To house Celestial Pearl Danio (Galaxy Rasbora) and Fairy Cichlid (Brichardi) together, plan for an aquarium of at least 132 litres with a minimum length of 75 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, Sand (Sifters), Smooth Gravel (Sensitive Barbels). 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.
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Frequently Asked Questions
Can Celestial Pearl Danio (Galaxy Rasbora) and Fairy Cichlid (Brichardi) live together?▾
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Celestial Pearl Danio (Galaxy Rasbora) and Fairy Cichlid (Brichardi) need?▾
A minimum of 132 litres (tank length at least 75 cm) is recommended. This provides enough space for both species to establish their own areas and reduces the likelihood of territorial disputes.
What water temperature is best for Celestial Pearl Danio (Galaxy Rasbora) and Fairy Cichlid (Brichardi) together?▾
Keep the aquarium between 23°C and 26°C. A target of around 24.5°C sits comfortably within both species' preferred ranges.
Are Celestial Pearl Danio (Galaxy Rasbora) or Fairy Cichlid (Brichardi) aggressive?▾
Celestial Pearl Danio (Galaxy Rasbora) is peaceful (2/10) and Fairy Cichlid (Brichardi) is semi-aggressive (8/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Celestial Pearl Danio (Galaxy Rasbora) and Fairy Cichlid (Brichardi) need?▾
Their pH requirements do not overlap. Celestial Pearl Danio (Galaxy Rasbora) prefers 6.5–7.5, while Fairy Cichlid (Brichardi) needs 8–9. This makes them incompatible in the same water chemistry.
How do I manage Fairy Cichlid (Brichardi)'s territorial behaviour?▾
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Fairy Cichlid (Brichardi) space to claim a territory without encroaching on the other fish's area. Adding décor that divides the tank into distinct zones works especially well.
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