Oscar and Peacock Cichlid Compatibility Overview
Short answer: only with care. Their pH ranges overlap only partly. It can work in a large, well-planted tank if you watch both fish closely for the first weeks.
Oscar and Peacock Cichlid can potentially coexist, but the combination requires careful attention. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. Oscar is aggressive and Peacock Cichlid is semi. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely. A larger tank (minimum 100 gallons), dense planting, and close monitoring are essential.
| Factor | Oscar | Peacock Cichlid | Verdict |
|---|---|---|---|
| Temperature | 74โ81ยฐF | 73โ84ยฐF | โ 74โ81ยฐF |
| pH Range | 6.0โ8.0 | 7.5โ9.0 | โ ๏ธ 7.5โ8.0 (narrow) |
| Temperament | aggressive | semi | โ Risk |
| Adult Size | 14 in | 5.1 in | โ ๏ธ 2.7ร difference |
| Min. Group | 1+ | 4+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Caution Points
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.
Peacock Cichlid โ Aulonocara stuartgranti
The Peacock Cichlid, Aulonocara nyassae, is a stunning fish with vibrant blue and yellow colors. These fish are known for their aggression and require a mature and well-maintained tank. They are best kept in pairs or in a species-specific tank. Careful attention must be given to water parameters and tank setup to ensure their health and well-being.
Frequently Asked Questions
Can Oscar live with Peacock Cichlid?
With significant caution and a larger tank. Oscar and Peacock Cichlid can potentially coexist, but the combination requires careful attention. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. Oscar is aggressive and Peacock Cichlid is semi. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely. A larger tank (minimum 100 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Oscar and Peacock Cichlid together?
A minimum of 100 gallons is recommended for keeping Oscar and Peacock Cichlid together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Oscar and Peacock Cichlid?
74โ81ยฐF โ inside Oscar's 74โ81ยฐF and Peacock Cichlid's 73โ84ยฐF.
Is a Oscar aggressive toward a Peacock Cichlid?
Oscar is aggressive and Peacock Cichlid is semi. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely.
Safer Tank Mates for Oscar and Peacock Cichlid
The highest-scoring compatible partners for each species in our compatibility data.
For Peacock Cichlid
- Molly โ 87/100
- Electric Yellow Cichlid โ 86/100
- Frontosa Cichlid โ 86/100
- Three Spot Gourami โ 80/100
- Guppy โ 77/100
Related Compatibility Guides
Tank Size for Oscar and Peacock Cichlid
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. |