Compatibility Overview
Black Neon Tetra and Diamond Tetra can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 29-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Black Neon Tetra | Diamond Tetra | Verdict |
|---|---|---|---|
| Temperature | 72–82°F | 72–82°F | ✅ 72–82°F |
| pH Range | 6.0–7.0 | 6.0–7.5 | ✅ 6.0–7.0 |
| Temperament | semi | semi | ⚠️ Monitor |
| Adult Size | 0.8 in | 1.2 in | ✅ Similar |
| Min. Group | 6+ | 6+ | See below |
| Min. Tank Size | 29 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Black Neon Tetra — Aquarium species
The Black Neon Tetra is a popular freshwater species known for its vibrant colors and peaceful temperament. It is an excellent addition to community tanks, thriving in groups of 6 or more. These tetras require a well-maintained aquarium with a flowing current and plenty of swimming space. With proper care, they can live up to 5 years. They are adaptable to v
→ Full Black Neon Tetra care guide
Diamond Tetra — Aquarium species
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.
Frequently Asked Questions
Can Black Neon Tetra live with Diamond Tetra?
Yes, in a well-planned setup. Black Neon Tetra and Diamond Tetra can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 29-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Black Neon Tetra and Diamond Tetra together?
A minimum of 29 gallons is recommended for keeping Black Neon Tetra and Diamond Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Black Neon Tetra and Diamond Tetra?
72–82°F
Is a Black Neon Tetra aggressive toward a Diamond Tetra?
Black Neon Tetra is semi and Diamond Tetra is semi. No major aggression issues are expected between these species.
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 | 100/100 |
| Temperament | 62/100 |
| Adult Size | 100/100 |
| Swim Zone | 68/100 |
| Social Needs | 85/100 |
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 | 29 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 40 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 75 gal | Best when keeping larger schools or reducing territorial pressure. |