Compatibility Overview
Kuhli Loach and Swordtail can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 55-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Kuhli Loach | Swordtail | Verdict |
|---|---|---|---|
| Temperature | 73–82°F | 65–80°F | ✅ 73–80°F |
| pH Range | 5.5–7.0 | 7.0–8.3 | ⚠️ 7.0–7.0 (narrow) |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 3.5 in | 5 in | ✅ Similar |
| Min. Group | 3+ | 3+ | See below |
| Min. Tank Size | 55 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Kuhli Loach — Pangio kuhlii
Eel-like bottom dwellers that are peaceful with all non-aggressive fish. Nocturnal and reclusive; need caves and soft substrate.
Swordtail — Xiphophorus hellerii
Hardy livebearer with a distinctive elongated lower tail fin in males. Peaceful community fish that tolerate a wide temperature range.
Frequently Asked Questions
Can Kuhli Loach live with Swordtail?
Yes, in a well-planned setup. Kuhli Loach and Swordtail can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 55-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Kuhli Loach and Swordtail together?
A minimum of 55 gallons is recommended for keeping Kuhli Loach and Swordtail together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Kuhli Loach and Swordtail?
73–80°F
Is a Kuhli Loach aggressive toward a Swordtail?
Kuhli Loach is peaceful and Swordtail is peaceful. pH ranges barely or do not overlap: Kuhli Loach prefers 5.5–7.0; Swordtail prefers 7.0–8.3.