Fish comparison
Black Neon Tetra vs Serpae Tetra
How the Black Neon Tetra and Serpae Tetra compare on care, size, water and temperament, and which fish suits your tank.
By Mike ElmiraUpdated
TL;DR, Black Neon Tetra vs Serpae Tetra
The Black Neon Tetra and the Serpae Tetra are close cousins, both in the Hyphessobrycon group, so at a glance they ask for a lot of the same things. Both are happy somewhere around 22 to 27 °C and pH 5.5 to 7.5, so a single tank can suit either one. The Black Neon Tetra is the more forgiving of the two, which matters if this is an early tank, while the Serpae Tetra rewards a bit more attention. If tank space is tight, the Black Neon Tetra needs less room to feel settled; give the Serpae Tetra the nod when you have the litres to spare.
Group compatibility overview
Excellent fit
Every key parameter overlaps and no major conflicts surfaced.
4 notes
Temperature
- Black Neon Tetra22–28 °C
- Serpae Tetra22–27 °C
pH
- Black Neon Tetra5.5–7.5
- Serpae Tetra5.5–7.5
Hardness
- Black Neon Tetra2–12 dGH
- Serpae Tetra2–15 dGH
What to plan for
- Black Neon Tetra schools, stock at least 8You've planned for 1 black neon tetra. Black Neon Tetra need a group of at least 8 to feel safe and shoal naturally, below that they're stressed and lose colour. Dial up the count, or remove the species.
- Serpae Tetra schools, stock at least 8You've planned for 1 serpae tetra. Serpae Tetra need a group of at least 8 to feel safe and shoal naturally, below that they're stressed and lose colour. Dial up the count, or remove the species.
- No bottom teamNo bottom-dwelling fish or shrimp. A small group of corydoras or a shrimp colony picks up leftover food and keeps detritus in check.
- 100% of your fish swim in the midHeavy concentration in a single zone. Spreading stocking across all three levels makes the tank read fuller for the same bioload.
Full attributes
Every parameter, side by side| Parameter |  FishBlack Neon TetraHyphessobrycon herbertaxelrodi |  FishSerpae TetraHyphessobrycon eques |
|---|---|---|
| Category | Fish | Fish |
| Origin | Paraguay River basin, Brazil | Amazon and Paraguay basins |
| Family | Characidae | Characidae |
| Temperature | 22–28 °C | 22–27 °C |
| pH | 5.5–7.5 | 5.5–7.5 |
| Hardness (dGH) | 2–12 | 2–15 |
| Flow rate | Low to Medium | Low to Medium |
| Min tank | 60 L | 90 L |
| Adult size | 3–4 cm | 4–5 cm |
| Difficulty | 1 / 5 | 2 / 5 |
| Lifespan | 5 yrs | 5–7 yrs |
| Diet | Omnivore | Omnivore |
| Water column | Mid | Mid |
| Schooling | Yes | Yes |
| Plant safe | Yes | Yes |
| Shrimp safe | Mostly (may eat shrimplets) | No (adults pick at shrimplets) |
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Can you keep Black Neon Tetra and Serpae Tetra together?
Yes. Their temperature and pH ranges overlap around 22 to 27 °C and pH 5.5 to 7.5, so one set of water conditions keeps both comfortable. Match group sizes and cover the usual planted-tank basics and they share a tank fine.
Which is easier to keep, the Black Neon Tetra or the Serpae Tetra?
The Black Neon Tetra is the easier of the two, closer to very easy, while the Serpae Tetra leans beginner-friendly.
Do Black Neon Tetra and Serpae Tetra need the same water?
Close to it. Aim for 22 to 27 °C and pH 5.5 to 7.5 and you're in the shared sweet spot for both. Full ranges are in the table above.
What's the main difference between the Black Neon Tetra and the Serpae Tetra?
Temperament is the big one. The Black Neon Tetra is peaceful and the Serpae Tetra is semi-aggressive, which changes who you can house them with.