Compatibility Overview
Black Ruby Barb and Fire Eel are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
| Factor | Black Ruby Barb | Fire Eel | Verdict |
|---|---|---|---|
| Temperature | 72–79°F | 75–82°F | ✅ 75–79°F |
| pH Range | 6.5–7.5 | 6.0–7.0 | ⚠️ 6.5–7.0 (narrow) |
| Temperament | aggressive | aggressive | ❌ Risk |
| Adult Size | 1.6 in | 19.7 in | ❌ 12× difference |
| Min. Group | 6+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
✅ Compatibility Positives
❌ Incompatibility Reasons
Species Profiles
Black Ruby Barb — Aquarium species
The Black Ruby Barb is a vibrant, active species suitable for beginners. It requires a spacious tank and a school of its own kind to thrive. Its striking colors and lively nature make it a popular choice.
→ Full Black Ruby Barb care guide
Fire Eel — Aquarium species
The Fire Eel is a stunning, red-bottomed species that requires a spacious tank. They are peaceful bottom feeders and do best in a well-planted, mature aquarium. With a moderate activity level, they can be a great addition to a community tank, but their size and diet may be incompatible with smaller fish. Regular water changes and careful tank management are
Frequently Asked Questions
Can Black Ruby Barb live with Fire Eel?
Generally not recommended. Black Ruby Barb and Fire Eel are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
What tank size do I need for Black Ruby Barb and Fire Eel together?
A minimum of 100 gallons is recommended for keeping Black Ruby Barb and Fire Eel together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Black Ruby Barb and Fire Eel?
75–79°F
Is a Black Ruby Barb aggressive toward a Fire Eel?
Black Ruby Barb is aggressive and Fire Eel is aggressive. The adult size gap creates a meaningful predation risk.
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 | 57/100 |
| Ph | 50/100 |
| Temperament | 12/100 |
| Adult Size | 8/100 |
| Swim Zone | 92/100 |
| 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 | 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. |