Oscar and Rosy Barb Compatibility Overview
Oscar and Rosy Barb are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Their ranges meet only at 74โ75ยฐF, 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 | Oscar | Rosy Barb | Verdict |
|---|---|---|---|
| Temperature | 74โ81ยฐF | 61โ75ยฐF | โ ๏ธ 74โ75ยฐF (narrow) |
| pH Range | 6.0โ8.0 | 6.0โ8.0 | โ 6.0โ8.0 |
| Temperament | aggressive | peaceful | โ Risk |
| Adult Size | 14 in | 3.9 in | โ ๏ธ 3.6ร difference |
| Min. Group | 1+ | 8+ | 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.
Rosy Barb โ Pethia conchonius
The Rosy Barb is a popular freshwater fish known for its vibrant coloration and peaceful nature. It is well-suited for community tanks with other non-aggressive species. They require a well-maintained environment and can be sensitive to water quality fluctuations. With proper care, they can thrive and add a splash of color to your aquarium.
Frequently Asked Questions
Can Oscar live with Rosy Barb?
Generally not recommended. Oscar and Rosy Barb are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Their ranges meet only at 74โ75ยฐF, 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 Oscar and Rosy Barb together?
A minimum of 100 gallons is recommended for keeping Oscar and Rosy Barb together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Oscar and Rosy Barb?
74โ75ยฐF (narrow) โ inside Oscar's 74โ81ยฐF and Rosy Barb's 61โ75ยฐF.
Is a Oscar aggressive toward a Rosy Barb?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Oscar and Rosy Barb
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. |