Can Scat (Brackish) and Swordtail Live Together?
Keeping Scat (Brackish) and Swordtail together is possible but requires caution, though some care is needed. Provide a spacious tank of at least 450 litres with plenty of hiding spots to reduce stress. Monitor behaviour closely, especially during the first few weeks.
At a Glance
Can your tank handle Scat (Brackish) and Swordtail?
Compatibility is only part of the answer. Test both fish with your real tank size, current stock, and maintenance needs to see if you have enough space and a safe stocking level before you add them.
Shared setup supplies
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Behaviour & Temperament
Both Scat (Brackish) 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.
Scat (Brackish) 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.
To improve the chances of a peaceful coexistence in this community tank: Keep fin nippers in larger groups to distribute nipping behaviour among conspecifics rather than tank mates.
Water Parameters
The safe temperature window for both species falls between 21°C and 28°C. Aim for the midpoint of this range (around 24.5°C) for optimal comfort.
Both fish can tolerate a pH between 7.5 and 8.3. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 12–30 dGH. Regular testing will ensure conditions stay within this range.
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Tank Setup
To house Scat (Brackish) and Swordtail together, plan for an aquarium of at least 450 litres with a minimum length of 150 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.
Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.
Specific environmental needs for this combination include: Sand (Sifters), Smooth Gravel (Sensitive Barbels), Established Algae (Otocinclus), Plants - Densely covered. Meeting these requirements will help both species thrive.
Note a potential conflict in setup requirements: Scat (Brackish) is a plant destroyer, which conflicts with Swordtail's requirement for live plants. Compromise where possible or prioritise the more critical need.
Both species do well with high (river/stream) water movement, so a standard filtration setup rated for the tank volume should suffice.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Scat (Brackish) and Swordtail.
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Frequently Asked Questions
Can Scat (Brackish) and Swordtail live together?
They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 450 litres), plenty of hiding spots, and watch for signs of stress or aggression.
What size tank do Scat (Brackish) and Swordtail need?
A minimum of 450 litres (tank length at least 150 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 Scat (Brackish) and Swordtail together?
Keep the aquarium between 21°C and 28°C. A target of around 24.5°C sits comfortably within both species' preferred ranges.
Are Scat (Brackish) or Swordtail aggressive?
Scat (Brackish) 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 Scat (Brackish) and Swordtail need?
Both species overlap in the 7.5–8.3 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Will Scat (Brackish) nip Swordtail's fins?
Scat (Brackish) is a known fin nipper. If Swordtail has long or flowing fins, there is a real risk of fin damage. Keeping Scat (Brackish) in a larger group can help redirect nipping behaviour toward conspecifics.
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