Discus and Guppy Compatibility Overview
Discus and Guppy are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Their ranges meet only at 82โ82ยฐF, which leaves no margin for a heater drifting or a warm room. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Discus | Guppy | Verdict |
|---|---|---|---|
| Temperature | 82โ88ยฐF | 72โ82ยฐF | โ ๏ธ 82โ82ยฐF (narrow) |
| pH Range | 5.0โ7.0 | 6.8โ8.5 | โ ๏ธ 6.8โ7.0 (narrow) |
| Temperament | semi | peaceful | โ ๏ธ Monitor |
| Adult Size | 8 in | 2.5 in | โ ๏ธ 3.2ร difference |
| 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.
Guppy โ Poecilia reticulata
Hardy and colourful livebearers. Males' long flowing tails make them targets for fin-nipping species. Very prolific breeders.
Frequently Asked Questions
Can Discus live with Guppy?
Generally not recommended. Discus and Guppy are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Their ranges meet only at 82โ82ยฐF, which leaves no margin for a heater drifting or a warm room. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Discus and Guppy together?
A minimum of 100 gallons is recommended for keeping Discus and Guppy together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Discus and Guppy?
82โ82ยฐF (narrow) โ inside Discus's 82โ88ยฐF and Guppy's 72โ82ยฐF.
Is a Discus aggressive toward a Guppy?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Discus and Guppy
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. |