Angelfish and Discus Compatibility Overview
Angelfish and Discus can potentially coexist, but the combination requires careful attention. Their ranges meet only at 82โ84ยฐF, which leaves no margin for a heater drifting or a warm room. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. A larger tank (minimum 100 gallons), dense planting, and close monitoring are essential.
| Factor | Angelfish | Discus | Verdict |
|---|---|---|---|
| Temperature | 74โ84ยฐF | 82โ88ยฐF | โ ๏ธ 82โ84ยฐF (narrow) |
| pH Range | 6.0โ7.5 | 5.0โ7.0 | โ 6.0โ7.0 |
| Temperament | semi | semi | โ ๏ธ Monitor |
| Adult Size | 6 in | 8 in | โ Similar |
| Min. Group | 1+ | 5+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Caution Points
Species Profiles
Angelfish โ Pterophyllum scalare
Elegant South American cichlids with long flowing fins. Generally peaceful but territorial when breeding and will eat very small fish.
Discus โ Symphysodon spp.
The 'king of the aquarium' โ beautiful but demanding. Requires very warm, soft, acidic water that excludes most community fish.
Frequently Asked Questions
Can Angelfish live with Discus?
With significant caution and a larger tank. Angelfish and Discus can potentially coexist, but the combination requires careful attention. Their ranges meet only at 82โ84ยฐF, which leaves no margin for a heater drifting or a warm room. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. A larger tank (minimum 100 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Angelfish and Discus together?
A minimum of 100 gallons is recommended for keeping Angelfish and Discus together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Angelfish and Discus?
82โ84ยฐF (narrow) โ inside Angelfish's 74โ84ยฐF and Discus's 82โ88ยฐF.
Is a Angelfish aggressive toward a Discus?
Angelfish is semi and Discus is semi. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Angelfish and Discus
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. |