Can Blind Cave Tetra and Swordtail Live Together?
Yes, Blind Cave Tetra and Swordtail 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 132 litres is recommended.
At a Glance
Behaviour & Temperament
Both Blind Cave Tetra and Swordtail are generally mild-mannered species with an aggression score of 4/10. Their matching temperaments mean neither fish is likely to dominate the other in a shared aquarium.
Blind Cave Tetra and Swordtail 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.
Worth noting: Swordtail is a known jumper, so a tight-fitting lid is essential.
Water Parameters
The safe temperature window for both species falls between 21°C and 25°C. Aim for the midpoint of this range (around 23.0°C) for optimal comfort.
Both fish can tolerate a pH between 7 and 8. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 12–20 dGH. Regular testing will ensure conditions stay within this range. An aquarium test kit is recommended for monitoring.
Tank Setup
To house Blind Cave Tetra and Swordtail 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: Smooth Gravel (Sensitive Barbels), Plants - Densely covered. 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.
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Frequently Asked Questions
Can Blind Cave Tetra and Swordtail live together?▾
Yes. Blind Cave Tetra and Swordtail are considered ideal tank mates. Their water parameters, temperaments, and behaviour profiles are well matched for a community aquarium.
What size tank do Blind Cave Tetra and Swordtail need?▾
A minimum of 132 litres (tank length at least 80 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 Blind Cave Tetra and Swordtail together?▾
Keep the aquarium between 21°C and 25°C. A target of around 23.0°C sits comfortably within both species' preferred ranges.
Are Blind Cave Tetra or Swordtail aggressive?▾
Blind Cave Tetra is generally mild-mannered (4/10) and Swordtail is generally mild-mannered (4/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Blind Cave Tetra and Swordtail need?▾
Both species overlap in the 7–8 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Will Blind Cave Tetra nip Swordtail's fins?▾
Blind Cave Tetra is a known fin nipper. If Swordtail has long or flowing fins, there is a real risk of fin damage. Keeping Blind Cave Tetra in a larger group can help redirect nipping behaviour toward conspecifics.
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