Compatibility Overview
Cardinal Tetra and Electric Yellow Cichlid can potentially coexist, but the combination requires careful attention. Some combination of water parameter differences, size mismatch, or temperament issues make this pair challenging. A larger tank (minimum 40 gallons), dense planting, and close monitoring are essential.
| Factor | Cardinal Tetra | Electric Yellow Cichlid | Verdict |
|---|---|---|---|
| Temperature | 73–82°F | 75–82°F | ✅ 75–82°F |
| pH Range | 4.5–7.0 | 7.5–8.5 | ❌ No overlap |
| Temperament | peaceful | aggressive | ❌ Risk |
| Adult Size | 1.5 in | 2.4 in | ✅ Similar |
| Min. Group | 6+ | 1+ | See below |
| Min. Tank Size | 40 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Cardinal Tetra — Paracheirodon axelrodi
Brilliant red-and-blue schooling fish from the Rio Negro. Prefers soft, acidic, warm water — a natural companion for discus.
→ Full Cardinal Tetra care guide
Electric Yellow Cichlid — Aquarium species
The Electric Yellow Cichlid is a popular freshwater species known for its striking yellow coloration and moderate aggression. It requires a spacious tank with hiding spots and is best kept with peaceful tankmates. This species is suitable for beginner aquarists.
Frequently Asked Questions
Can Cardinal Tetra live with Electric Yellow Cichlid?
With significant caution and a larger tank. Cardinal Tetra and Electric Yellow Cichlid can potentially coexist, but the combination requires careful attention. Some combination of water parameter differences, size mismatch, or temperament issues make this pair challenging. A larger tank (minimum 40 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Cardinal Tetra and Electric Yellow Cichlid together?
A minimum of 40 gallons is recommended for keeping Cardinal Tetra and Electric Yellow Cichlid together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Cardinal Tetra and Electric Yellow Cichlid?
75–82°F
Is a Cardinal Tetra aggressive toward a Electric Yellow Cichlid?
Cardinal Tetra is peaceful and Electric Yellow Cichlid is aggressive. Their preferred pH ranges are difficult to reconcile.
Related Compatibility Guides
Compatibility score breakdown
The overall score is weighted across water chemistry, behavior, adult size, swimming zone, and social needs. A score is a planning aid—not a guarantee for individual fish.
| Factor | Score |
|---|---|
| Temperature | 100/100 |
| Ph | 0/100 |
| Temperament | 30/100 |
| Adult Size | 100/100 |
| Swim Zone | 68/100 |
| Social Needs | 92/100 |
Tank size scenarios
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 40 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 55 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 90 gal | Best when keeping larger schools or reducing territorial pressure. |