Discus and Goldfish Compatibility Overview
Short answer: No. Discus needs 82-88°F and Goldfish needs 50-74°F. Keep them in separate tanks, or pick one of the safer tank mates listed below.
Discus and Goldfish are generally not recommended to be housed together. Goldfish is a cool-water fish and Discus is tropical, so the usable temperature range decides this pairing. Goldfish require cool water (50–74°F) incompatible with discus (82–88°F). Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Discus | Goldfish | Verdict |
|---|---|---|---|
| Temperature | 82–88°F | 50–74°F | ❌ No overlap |
| pH Range | 5.0–7.0 | 6.5–8.0 | ⚠️ 6.5–7.0 (narrow) |
| Temperament | semi | peaceful | ⚠️ Monitor |
| Adult Size | 8 in | 12 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.
Goldfish — Carassius auratus
Classic pond and aquarium fish that prefer cool water. Heavy waste producers that require robust filtration. Will eat small fish and shrimp.
Frequently Asked Questions
Can Discus live with Goldfish?
Generally not recommended. Discus and Goldfish are generally not recommended to be housed together. Goldfish is a cool-water fish and Discus is tropical, so the usable temperature range decides this pairing. Goldfish require cool water (50–74°F) incompatible with discus (82–88°F). Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Discus and Goldfish together?
A minimum of 100 gallons is recommended for keeping Discus and Goldfish together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Discus and Goldfish?
There is no safe shared range: Discus needs 82–88°F and Goldfish needs 50–74°F.
Is a Discus aggressive toward a Goldfish?
Discus is semi and Goldfish is peaceful. No major aggression issues are expected between these species.
Safer Tank Mates for Discus and Goldfish
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
For Goldfish
- Weather Loach — 98/100
- Bristlenose Pleco — 87/100
- Denison Barb — 87/100
- Koi — 86/100
- Swordtail — 79/100
Related Compatibility Guides
Tank Size for Discus and Goldfish
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. |