Green Terror Cichlid and Oscar Compatibility Overview
Short answer: No. Green Terror Cichlid needs 68-75°F and Oscar needs 74-81°F. Keep them in separate tanks, or pick one of the safer tank mates listed below.
Green Terror Cichlid and Oscar are generally not recommended to be housed together. Their ranges meet only at 74–75°F, which leaves no margin for a heater drifting or a warm room. Green Terror Cichlid and Oscar are both aggressive; housing them together invites sustained fighting rather than an occasional squabble. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Green Terror Cichlid | Oscar | Verdict |
|---|---|---|---|
| Temperature | 68–75°F | 74–81°F | ⚠️ 74–75°F (narrow) |
| pH Range | 6.5–8.0 | 6.0–8.0 | ✅ 6.5–8.0 |
| Temperament | aggressive | aggressive | ❌ Risk |
| Adult Size | 11.8 in | 14 in | ✅ Similar |
| Min. Group | 1+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Green Terror Cichlid — Andinoacara rivulatus
The Green Terror Cichlid is a popular choice for experienced aquarists due to its striking appearance and vibrant colors. They are known for their aggression and should be kept in a species-specific tank. Their tall, laterally compressed bodies and vivid coloration make them visually appealing but require careful handling due to their potentially aggressive…
→ Full Green Terror Cichlid care guide
Oscar — 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 Green Terror Cichlid live with Oscar?
Generally not recommended. Green Terror Cichlid and Oscar are generally not recommended to be housed together. Their ranges meet only at 74–75°F, which leaves no margin for a heater drifting or a warm room. Green Terror Cichlid and Oscar are both aggressive; housing them together invites sustained fighting rather than an occasional squabble. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Green Terror Cichlid and Oscar together?
A minimum of 100 gallons is recommended for keeping Green Terror Cichlid and Oscar together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Green Terror Cichlid and Oscar?
74–75°F (narrow) — inside Green Terror Cichlid's 68–75°F and Oscar's 74–81°F.
Is a Green Terror Cichlid aggressive toward a Oscar?
Green Terror Cichlid and Oscar are both aggressive; housing them together invites sustained fighting rather than an occasional squabble.
Related Compatibility Guides
Tank Size for Green Terror Cichlid 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 | 180 gal | Best when keeping larger schools or reducing territorial pressure. |