Discus and Oscar Compatibility Overview
Short answer: No. Discus needs 82-88°F and Oscar needs 74-81°F. Keep them in separate tanks, or pick one of the safer tank mates listed below.
Discus and Oscar are generally not recommended to be housed together. There is no shared temperature: Discus needs 82–88°F and Oscar needs 74–81°F. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Discus | Oscar | Verdict |
|---|---|---|---|
| Temperature | 82–88°F | 74–81°F | ❌ No overlap |
| pH Range | 5.0–7.0 | 6.0–8.0 | ✅ 6.0–7.0 |
| Temperament | semi | aggressive | ❌ Risk |
| Adult Size | 8 in | 14 in | ✅ Similar |
| Min. Group | 5+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Discus — Symphysodon spp.
The 'king of the aquarium' — beautiful but demanding. Requires very warm, soft, acidic water that excludes most community fish.
Oscar — Astronotus ocellatus
Intelligent but aggressive cichlids that will eat any fish small enough to fit in their mouth. Require large tanks (75+ gallons) and robust tank mates.
Frequently Asked Questions
Can Discus live with Oscar?
Generally not recommended. Discus and Oscar are generally not recommended to be housed together. There is no shared temperature: Discus needs 82–88°F and Oscar needs 74–81°F. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Discus and Oscar together?
A minimum of 100 gallons is recommended for keeping Discus and Oscar together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Discus and Oscar?
There is no safe shared range: Discus needs 82–88°F and Oscar needs 74–81°F.
Is a Discus aggressive toward a Oscar?
Discus is semi and Oscar is aggressive. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely.
Safer Tank Mates for Discus and Oscar
The highest-scoring compatible partners for each species in our compatibility data.
For Discus
- Moonlight Gourami — 81/100
- Clown Loach — 80/100
- Three Spot Gourami — 79/100
- African Butterfly Fish — 77/100
- Cardinal Tetra — 76/100
Related Compatibility Guides
Tank Size for Discus and Oscar
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. |