Discus and Swordtail Compatibility Overview
Discus and Swordtail are generally not recommended to be housed together. There is no shared temperature: Discus needs 82โ88ยฐF and Swordtail needs 65โ80ยฐF. Their usable pH overlap is narrow and requires stable, tested water. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Discus | Swordtail | Verdict |
|---|---|---|---|
| Temperature | 82โ88ยฐF | 65โ80ยฐF | โ No overlap |
| pH Range | 5.0โ7.0 | 7.0โ8.3 | โ ๏ธ 7.0โ7.0 (narrow) |
| Temperament | semi | peaceful | โ ๏ธ Monitor |
| Adult Size | 8 in | 5 in | โ Similar |
| Min. Group | 5+ | 3+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Discus โ Symphysodon spp.
The 'king of the aquarium' โ beautiful but demanding. Requires very warm, soft, acidic water that excludes most community fish.
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 Discus live with Swordtail?
Generally not recommended. Discus and Swordtail are generally not recommended to be housed together. There is no shared temperature: Discus needs 82โ88ยฐF and Swordtail needs 65โ80ยฐF. Their usable pH overlap is narrow and requires stable, tested water. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Discus and Swordtail together?
A minimum of 100 gallons is recommended for keeping Discus and Swordtail together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Discus and Swordtail?
There is no safe shared range: Discus needs 82โ88ยฐF and Swordtail needs 65โ80ยฐF.
Is a Discus aggressive toward a Swordtail?
Discus is semi and Swordtail is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Discus and Swordtail
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 100 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 150 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 220 gal | Best when keeping larger schools or reducing territorial pressure. |