Discus and Otocinclus Compatibility Overview
Discus and Otocinclus 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 | Otocinclus | Verdict |
|---|---|---|---|
| Temperature | 82โ88ยฐF | 72โ82ยฐF | โ ๏ธ 82โ82ยฐF (narrow) |
| pH Range | 5.0โ7.0 | 6.0โ7.5 | โ 6.0โ7.0 |
| Temperament | semi | peaceful | โ ๏ธ Monitor |
| Adult Size | 8 in | 1.5 in | โ 5ร difference |
| Min. Group | 5+ | 4+ | 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.
Otocinclus โ Otocinclus spp.
Tiny algae-eating catfish that are peaceful with all species. Need established algae growth and biofilm; sensitive to ammonia.
Frequently Asked Questions
Can Discus live with Otocinclus?
Generally not recommended. Discus and Otocinclus 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 Otocinclus together?
A minimum of 100 gallons is recommended for keeping Discus and Otocinclus together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Discus and Otocinclus?
82โ82ยฐF (narrow) โ inside Discus's 82โ88ยฐF and Otocinclus's 72โ82ยฐF.
Is a Discus aggressive toward a Otocinclus?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Discus and Otocinclus
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. |