Fish comparison
Siamese Fighting Fish vs Neon Tetra
How the Siamese Fighting Fish and Neon Tetra compare on care, size, water and temperament, and which fish suits your tank.
By Mike ElmiraUpdated
TL;DR, Siamese Fighting Fish vs Neon Tetra
The Siamese Fighting Fish and the Neon Tetra come up together a lot when people are choosing a fish, and they are close enough to weigh side by side. Both are happy somewhere around 24 to 26 °C and pH 6 to 7, 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 Siamese Fighting Fish needs less room to feel settled; give the Neon Tetra the nod when you have the litres to spare.
Group compatibility overview
Excellent fit
Every key parameter overlaps and no major conflicts surfaced.
1 note
Temperature
- Siamese Fighting Fish24–28 °C
- Neon Tetra20–26 °C
pH
- Siamese Fighting Fish6–7.5
- Neon Tetra5.5–7
Hardness
- Siamese Fighting Fish3–15 dGH
- Neon Tetra1–8 dGH
What to plan for
- Neon Tetra schools, stock at least 10You've planned for 1 neon tetra. Neon Tetra need a group of at least 10 to feel safe and shoal naturally, below that they're stressed and lose colour. Dial up the count, or remove the species.
Full attributes
Every parameter, side by side| Parameter |  FishSiamese Fighting FishBetta splendens |  FishNeon TetraParacheirodon innesi |
|---|---|---|
| Category | Fish | Fish |
| Origin | Mekong basin, Thailand and Cambodia | Upper Amazon basin, South America |
| Family | Osphronemidae | Characidae |
| Temperature | 24–28 °C | 20–26 °C |
| pH | 6.0–7.5 | 5.5–7.0 |
| Hardness (dGH) | 3–15 | 1–8 |
| Flow rate | Very low | Low to Medium |
| Min tank | 20 L | 60 L |
| Adult size | 6–7 cm | 3.5–4 cm |
| Difficulty | 2 / 5 | 2 / 5 |
| Lifespan | 3–5 yrs | 5–8 yrs |
| Diet | Carnivore | Omnivore |
| Water column | All | Mid |
| Schooling | No | Yes |
| Plant safe | Yes | Yes |
| Shrimp safe | No (adult bettas pick off shrimp) | Yes (with adults; 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 Siamese Fighting Fish and Neon Tetra together?
Yes. Their temperature and pH ranges overlap around 24 to 26 °C and pH 6 to 7, 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 Siamese Fighting Fish or the Neon Tetra?
They sit at the same care level, both beginner-friendly, so neither is the obvious beginner pick. The decision is really about the look you're after.
Do Siamese Fighting Fish and Neon Tetra need the same water?
Close to it. Aim for 24 to 26 °C and pH 6 to 7 and you're in the shared sweet spot for both. Full ranges are in the table above.
What's the main difference between the Siamese Fighting Fish and the Neon Tetra?
Temperament is the big one. The Siamese Fighting Fish is territorial when breeding and the Neon Tetra is peaceful, which changes who you can house them with.