Compatibility Overview
Blue Tang and Congo Tetra 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 | Blue Tang | Congo Tetra | Verdict |
|---|---|---|---|
| Temperature | 75–81°F | 72–79°F | ✅ 75–79°F |
| pH Range | 8.1–8.4 | 6.0–7.0 | ❌ No overlap |
| Temperament | semi | aggressive | ❌ Risk |
| Adult Size | 5.9 in | 1.6 in | ⚠️ 3.7× difference |
| Min. Group | 1+ | 6+ | See below |
| Min. Tank Size | 75 gallons (for both species) | — | |
✅ Compatibility Positives
❌ Incompatibility Reasons
Species Profiles
Blue Tang — Aquarium species
The Blue Tang is a popular saltwater fish known for its vibrant blue color and yellow stripes. These fish are generally peaceful and can be kept in a community tank with other non-aggressive species. They require a well-maintained, spacious tank with plenty of swimming space and hiding spots. Regular water changes and proper nutrition are essential for their
Congo Tetra — Aquarium species
The Congo Tetra is a vibrant and active fish that thrives in a well-maintained freshwater aquarium. With its striking coloration and peaceful nature, it's a great addition to any community tank. This species is best kept in groups and requires a spacious tank with plenty of swimming space. They are known for their playful nature and can be seen darting aroun
Frequently Asked Questions
Can Blue Tang live with Congo Tetra?
Generally not recommended. Blue Tang and Congo Tetra 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 Blue Tang and Congo Tetra together?
A minimum of 75 gallons is recommended for keeping Blue Tang and Congo Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Blue Tang and Congo Tetra?
75–79°F
Is a Blue Tang aggressive toward a Congo Tetra?
Blue Tang is semi and Congo Tetra is aggressive. These animals require different water types and cannot share one aquarium.
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 | 67/100 |
| Ph | 0/100 |
| Temperament | 25/100 |
| Adult Size | 38/100 |
| 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 | 75 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 125 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 150 gal | Best when keeping larger schools or reducing territorial pressure. |