Diamond Tetra and Oscar Compatibility Overview
Diamond Tetra and Oscar are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Diamond Tetra | Oscar | Verdict |
|---|---|---|---|
| Temperature | 75โ82ยฐF | 74โ81ยฐF | โ 75โ81ยฐF |
| pH Range | 5.5โ7.0 | 6.0โ8.0 | โ 6.0โ7.0 |
| Temperament | peaceful | aggressive | โ Risk |
| Adult Size | 2.4 in | 14 in | โ 6ร difference |
| Min. Group | 6+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Diamond Tetra โ Moenkhausia pittieri
The Diamond Tetra is a popular freshwater fish known for its vibrant colors and peaceful nature. It is well-suited for community tanks and can thrive in a variety of water conditions. With a moderate activity level and a preference for schools, this species is a great addition to any beginner or intermediate aquarist's tank.
โ Full Diamond Tetra care guide
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.
Frequently Asked Questions
Can Diamond Tetra live with Oscar?
Generally not recommended. Diamond Tetra and Oscar are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Diamond Tetra and Oscar together?
A minimum of 100 gallons is recommended for keeping Diamond Tetra and Oscar together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Diamond Tetra and Oscar?
75โ81ยฐF โ inside Diamond Tetra's 75โ82ยฐF and Oscar's 74โ81ยฐF.
Is a Diamond Tetra aggressive toward a Oscar?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Diamond Tetra and Oscar
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. |