Oscar and Pea Puffer Compatibility Overview
Oscar and Pea Puffer are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Oscar is aggressive and Pea Puffer is semi. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Oscar | Pea Puffer | Verdict |
|---|---|---|---|
| Temperature | 74โ81ยฐF | 74โ82ยฐF | โ 74โ81ยฐF |
| pH Range | 6.0โ8.0 | 7.0โ8.0 | โ 7.0โ8.0 |
| Temperament | aggressive | semi | โ Risk |
| Adult Size | 14 in | 1 in | โ 14ร difference |
| Min. Group | 1+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Oscar โ 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.
Pea Puffer โ Carinotetraodon travancoricus
World's smallest pufferfish โ intensely territorial and nippy despite tiny size. Will attack fins and eat shrimp and snails.
Frequently Asked Questions
Can Oscar live with Pea Puffer?
Generally not recommended. Oscar and Pea Puffer are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Oscar is aggressive and Pea Puffer is semi. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Oscar and Pea Puffer together?
A minimum of 100 gallons is recommended for keeping Oscar and Pea Puffer together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Oscar and Pea Puffer?
74โ81ยฐF โ inside Oscar's 74โ81ยฐF and Pea Puffer's 74โ82ยฐF.
Is a Oscar aggressive toward a Pea Puffer?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Oscar and Pea Puffer
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 | 180 gal | Best when keeping larger schools or reducing territorial pressure. |