Pygmy Corydoras and Swordtail Compatibility Overview
Pygmy Corydoras and Swordtail can potentially coexist, but the combination requires careful attention. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. A larger tank (minimum 75 gallons), dense planting, and close monitoring are essential.
| Factor | Pygmy Corydoras | Swordtail | Verdict |
|---|---|---|---|
| Temperature | 72โ79ยฐF | 65โ80ยฐF | โ 72โ79ยฐF |
| pH Range | 6.0โ7.5 | 7.0โ8.3 | โ ๏ธ 7.0โ7.5 (narrow) |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1 in | 5 in | โ 5ร difference |
| Min. Group | 6+ | 3+ | See below |
| Min. Tank Size | 75 gallons (for both species) | โ | |
Compatibility Positives
Caution Points
Species Profiles
Pygmy Corydoras โ Corydoras pygmaeus
Tiny armoured catfish that school in open water as well as on the substrate. Peaceful with all non-aggressive species.
โ Full Pygmy Corydoras care guide
Swordtail โ 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 Pygmy Corydoras live with Swordtail?
With significant caution and a larger tank. Pygmy Corydoras and Swordtail can potentially coexist, but the combination requires careful attention. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. A larger tank (minimum 75 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Pygmy Corydoras and Swordtail together?
A minimum of 75 gallons is recommended for keeping Pygmy Corydoras and Swordtail together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Pygmy Corydoras and Swordtail?
72โ79ยฐF โ inside Pygmy Corydoras's 72โ79ยฐF and Swordtail's 65โ80ยฐF.
Is a Pygmy Corydoras aggressive toward a Swordtail?
Pygmy Corydoras is peaceful and Swordtail is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Pygmy Corydoras and Swordtail
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 75 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 125 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 150 gal | Best when keeping larger schools or reducing territorial pressure. |