Can Harlequin Rasbora and Zebra Danio Live Together?
Yes, Harlequin Rasbora and Zebra Danio are ideal tank mates. Both species share compatible water parameters and peaceful temperaments, making them well-suited for a community aquarium. A minimum tank size of 72 litres is recommended.
At a Glance
Behaviour & Temperament
Harlequin Rasbora is a peaceful species (1/10), while Zebra Danio is generally mild-mannered (3/10). This modest difference means Zebra Danio may occasionally assert dominance over Harlequin Rasbora.
Harlequin Rasbora and Zebra Danio both frequent the Middle (Open Water) and Top (Surface) 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: Zebra Danio is a known jumper, so a tight-fitting lid is essential.
Water Parameters
The safe temperature window for both species falls between 22°C and 26°C. Aim for the midpoint of this range (around 24.0°C) for optimal comfort.
Both fish can tolerate a pH between 6.5 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 5–12 dGH. Regular testing will ensure conditions stay within this range.
Tank Setup
To house Harlequin Rasbora and Zebra Danio together, plan for an aquarium of at least 72 litres with a minimum length of 60 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, Leaf Litter/Blackwater, Smooth Gravel (Sensitive Barbels). 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.
Frequently Asked Questions
Can Harlequin Rasbora and Zebra Danio live together?▾
Yes. Harlequin Rasbora and Zebra Danio are considered ideal tank mates. Their water parameters, temperaments, and behaviour profiles are well matched for a community aquarium.
What size tank do Harlequin Rasbora and Zebra Danio need?▾
A minimum of 72 litres (tank length at least 60 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 Harlequin Rasbora and Zebra Danio together?▾
Keep the aquarium between 22°C and 26°C. A target of around 24.0°C sits comfortably within both species' preferred ranges.
Are Harlequin Rasbora or Zebra Danio aggressive?▾
Harlequin Rasbora is peaceful (1/10) and Zebra Danio is generally mild-mannered (3/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Harlequin Rasbora and Zebra Danio need?▾
Both species overlap in the 6.5–7.5 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Will Zebra Danio nip Harlequin Rasbora's fins?▾
Zebra Danio is a known fin nipper. If Harlequin Rasbora has long or flowing fins, there is a real risk of fin damage. Keeping Zebra Danio in a larger group can help redirect nipping behaviour toward conspecifics.
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