Fish comparison
Buenos Aires Tetra vs Lemon Tetra
How the Buenos Aires Tetra and Lemon Tetra compare on care, size, water and temperament, and which fish suits your tank.
By Mike ElmiraUpdated
TL;DR, Buenos Aires Tetra vs Lemon Tetra
The Buenos Aires Tetra and the Lemon 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 23 to 28 °C and pH 6 to 7.5, so a single tank can suit either one. Neither is harder than the other to keep, so the choice comes down to look and stocking rather than skill. If tank space is tight, the Lemon Tetra needs less room to feel settled; give the Buenos Aires 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
- Buenos Aires Tetra18–28 °C
- Lemon Tetra23–28 °C
pH
- Buenos Aires Tetra6–8
- Lemon Tetra5.5–7.5
Hardness
- Buenos Aires Tetra5–20 dGH
- Lemon Tetra2–15 dGH
What to plan for
- Buenos Aires Tetra schools, stock at least 8You've planned for 1 buenos aires tetra. Buenos Aires 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.
- Lemon Tetra schools, stock at least 8You've planned for 1 lemon tetra. Lemon 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 |  FishBuenos Aires TetraHyphessobrycon anisitsi |  FishLemon TetraHyphessobrycon pulchripinnis |
|---|---|---|
| Category | Fish | Fish |
| Origin | Paraguay, Uruguay, southern Brazil | Lower Amazon basin, Brazil |
| Family | Characidae | Characidae |
| Temperature | 18–28 °C | 23–28 °C |
| pH | 6.0–8.0 | 5.5–7.5 |
| Hardness (dGH) | 5–20 | 2–15 |
| Flow rate | Medium to high | Low to Medium |
| Min tank | 150 L | 75 L |
| Adult size | 7–10 cm | 4–5 cm |
| Difficulty | 1 / 5 | 1 / 5 |
| Lifespan | 5–7 yrs | 5–8 yrs |
| Diet | Omnivore (heavy plant-grazer) | Omnivore |
| Water column | Mid | Mid |
| Schooling | Yes | Yes |
| Plant safe | No (will defoliate soft plants) | Yes |
| Shrimp safe | No | Mostly (may eat shrimplets) |
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Can you keep Buenos Aires Tetra and Lemon Tetra together?
Yes. Their temperature and pH ranges overlap around 23 to 28 °C and pH 6 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 Buenos Aires Tetra or the Lemon Tetra?
They sit at the same care level, both very easy, so neither is the obvious beginner pick. The decision is really about the look you're after.
Do Buenos Aires Tetra and Lemon Tetra need the same water?
Close to it. Aim for 23 to 28 °C and pH 6 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 Buenos Aires Tetra and the Lemon Tetra?
Temperament is the big one. The Buenos Aires Tetra is semi-aggressive and the Lemon Tetra is peaceful, which changes who you can house them with.