Oscar and Zebra Danio Compatibility Overview
Oscar and Zebra Danio are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Oscar is aggressive and Zebra Danio is peaceful. 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 | Zebra Danio | Verdict |
|---|---|---|---|
| Temperature | 74โ81ยฐF | 64โ82ยฐF | โ 74โ81ยฐF |
| pH Range | 6.0โ8.0 | 6.5โ8.0 | โ 6.5โ8.0 |
| Temperament | aggressive | peaceful | โ Risk |
| Adult Size | 14 in | 2 in | โ 7ร difference |
| Min. Group | 1+ | 5+ | 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.
Zebra Danio โ Danio rerio
Extremely hardy, fast-moving schooling fish tolerant of a wide temperature range. Active top-to-mid swimmers compatible with most community fish.
Frequently Asked Questions
Can Oscar live with Zebra Danio?
Generally not recommended. Oscar and Zebra Danio are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Oscar is aggressive and Zebra Danio is peaceful. 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 Zebra Danio together?
A minimum of 100 gallons is recommended for keeping Oscar and Zebra Danio together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Oscar and Zebra Danio?
74โ81ยฐF โ inside Oscar's 74โ81ยฐF and Zebra Danio's 64โ82ยฐF.
Is a Oscar aggressive toward a Zebra Danio?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Oscar and Zebra Danio
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. |