Discus and Julii Cory Compatibility Overview
Discus and Julii Cory are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. There is no shared temperature: Discus needs 82โ88ยฐF and Julii Cory needs 68โ79ยฐF. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Discus | Julii Cory | Verdict |
|---|---|---|---|
| Temperature | 82โ88ยฐF | 68โ79ยฐF | โ No overlap |
| pH Range | 5.0โ7.0 | 5.5โ7.5 | โ 5.5โ7.0 |
| Temperament | semi | peaceful | โ ๏ธ Monitor |
| Adult Size | 8 in | 2.2 in | โ ๏ธ 3.6ร difference |
| Min. Group | 5+ | 6+ | 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.
Julii Cory โ Corydoras julii
The Julii Cory is a popular, peaceful bottom-dweller that thrives in community tanks. With a lifespan of up to 5 years, they are suitable for beginners and experienced aquarists alike. These fish are known for their dark brown coloration with distinctive white spots and a slender, flat body shape.
Frequently Asked Questions
Can Discus live with Julii Cory?
Generally not recommended. Discus and Julii Cory are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. There is no shared temperature: Discus needs 82โ88ยฐF and Julii Cory needs 68โ79ยฐF. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Discus and Julii Cory together?
A minimum of 100 gallons is recommended for keeping Discus and Julii Cory together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Discus and Julii Cory?
There is no safe shared range: Discus needs 82โ88ยฐF and Julii Cory needs 68โ79ยฐF.
Is a Discus aggressive toward a Julii Cory?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Discus and Julii Cory
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. |