Fish comparison
Neon Tetra vs Spotted Blue-eye
How the Neon Tetra and Spotted Blue-eye compare on care, size, water and temperament, and which fish suits your tank.
By Mike ElmiraUpdated
TL;DR, Neon Tetra vs Spotted Blue-eye
The Neon Tetra and the Spotted Blue-eye 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 22 to 26 °C and pH 5.5 to 7, so a single tank can suit either one. The Neon Tetra is the more forgiving of the two, which matters if this is an early tank, while the Spotted Blue-eye rewards a bit more attention. If tank space is tight, the Spotted Blue-eye 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.
3 notes
Temperature
- Neon Tetra20–26 °C
- Spotted Blue-eye22–28 °C
pH
- Neon Tetra5.5–7
- Spotted Blue-eye5–7.5
Hardness
- Neon Tetra1–8 dGH
- Spotted Blue-eye1–12 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.
- 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.
- 67% 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 |  FishNeon TetraParacheirodon innesi |  FishSpotted Blue-eyePseudomugil gertrudae |
|---|---|---|
| Category | Fish | Fish |
| Origin | Upper Amazon basin, South America | Northern Australia, New Guinea, Aru Islands |
| Family | Characidae | Pseudomugilidae |
| Temperature | 20–26 °C | 22–28 °C |
| pH | 5.5–7.0 | 5.0–7.5 |
| Hardness (dGH) | 1–8 | 1–12 |
| Flow rate | Low to Medium | Still to Low |
| Min tank | 60 L | 40 L |
| Adult size | 3.5–4 cm | 3–4 cm |
| Difficulty | 2 / 5 | 3 / 5 |
| Lifespan | 5–8 yrs | 1–2 yrs |
| Diet | Omnivore | Micropredator |
| Water column | Mid | Mid to Top |
| Schooling | Yes | Loose group |
| Plant safe | Yes | Yes |
| Shrimp safe | Yes (with adults; may eat shrimplets) | Yes (with adults) |
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Can you keep Neon Tetra and Spotted Blue-eye together?
Yes. Their temperature and pH ranges overlap around 22 to 26 °C and pH 5.5 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 Neon Tetra or the Spotted Blue-eye?
The Neon Tetra is the easier of the two, closer to beginner-friendly, while the Spotted Blue-eye leans middle-of-the-road.
Do Neon Tetra and Spotted Blue-eye need the same water?
Close to it. Aim for 22 to 26 °C and pH 5.5 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 Neon Tetra and the Spotted Blue-eye?
Space. The Neon Tetra wants about 60 litres minimum and the Spotted Blue-eye around 40, so tank size can settle it.