Black Neon Tetra and Harlequin Rasbora Compatibility Overview
Black Neon Tetra and Harlequin Rasbora can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Both species are peaceful, and neither poses a major aggression risk to the other. A minimum 20-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Black Neon Tetra | Harlequin Rasbora | Verdict |
|---|---|---|---|
| Temperature | 68โ82ยฐF | 72โ81ยฐF | โ 72โ81ยฐF |
| pH Range | 5.0โ7.5 | 5.5โ7.5 | โ 5.5โ7.5 |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1.4 in | 1.75 in | โ Similar |
| Min. Group | 8+ | 8+ | See below |
| Min. Tank Size | 20 gallons (for both species) | โ | |
Compatibility Positives
Caution Points
Species Profiles
Black Neon Tetra โ Hyphessobrycon herbertaxelrodi
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.
โ Full Black Neon Tetra care guide
Harlequin Rasbora โ Trigonostigma heteromorpha
Active mid-level schooling fish with a distinctive black triangular patch. One of the best all-around community tank fish.
Frequently Asked Questions
Can Black Neon Tetra live with Harlequin Rasbora?
Yes, in a well-planned setup. Black Neon Tetra and Harlequin Rasbora can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Both species are peaceful, and neither poses a major aggression risk to the other. A minimum 20-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 Harlequin Rasbora together?
A minimum of 20 gallons is recommended for keeping Black Neon Tetra and Harlequin Rasbora together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Black Neon Tetra and Harlequin Rasbora?
72โ81ยฐF โ inside Black Neon Tetra's 68โ82ยฐF and Harlequin Rasbora's 72โ81ยฐF.
Is a Black Neon Tetra aggressive toward a Harlequin Rasbora?
Black Neon Tetra is peaceful and Harlequin Rasbora is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Black Neon Tetra and Harlequin Rasbora
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 20 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 29 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 55 gal | Best when keeping larger schools or reducing territorial pressure. |