Fish comparison
Dwarf Pencilfish vs Neon Tetra
How the Dwarf Pencilfish and Neon Tetra compare on care, size, water and temperament, and which fish suits your tank.
By Mike ElmiraUpdated
TL;DR, Dwarf Pencilfish vs Neon Tetra
The Dwarf Pencilfish 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 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 Dwarf Pencilfish rewards a bit more attention. Read the full care notes on each below and pick the one whose look and pace fit the tank you're building.
Group compatibility overview
Excellent fit
Every key parameter overlaps and no major conflicts surfaced.
4 notes
Temperature
- Dwarf Pencilfish22–28 °C
- Neon Tetra20–26 °C
pH
- Dwarf Pencilfish5–7
- Neon Tetra5.5–7
Hardness
- Dwarf Pencilfish1–8 dGH
- Neon Tetra1–8 dGH
What to plan for
- Dwarf Pencilfish schools, stock at least 6You've planned for 1 dwarf pencilfish. Dwarf Pencilfish need a group of at least 6 to feel safe and shoal naturally, below that they're stressed and lose colour. Dial up the count, or remove the species.
- 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 |  FishDwarf PencilfishNannostomus marginatus |  FishNeon TetraParacheirodon innesi |
|---|---|---|
| Category | Fish | Fish |
| Origin | Western Guyana, Suriname, lower Amazon basin | Upper Amazon basin, South America |
| Family | Lebiasinidae | Characidae |
| Temperature | 22–28 °C | 20–26 °C |
| pH | 5.0–7.0 | 5.5–7.0 |
| Hardness (dGH) | 1–8 | 1–8 |
| Flow rate | Still to Low | Low to Medium |
| Min tank | 60 L | 60 L |
| Adult size | 3–3.5 cm | 3.5–4 cm |
| Difficulty | 3 / 5 | 2 / 5 |
| Lifespan | 3–5 yrs | 5–8 yrs |
| Diet | Micropredator | Omnivore |
| Water column | Mid to Top | Mid |
| Schooling | Yes (loose shoal) | Yes |
| Plant safe | Yes | Yes |
| Shrimp safe | Yes (adult 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 Dwarf Pencilfish and Neon Tetra 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 Dwarf Pencilfish or the Neon Tetra?
The Neon Tetra is the easier of the two, closer to beginner-friendly, while the Dwarf Pencilfish leans middle-of-the-road.
Do Dwarf Pencilfish and Neon Tetra 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 Dwarf Pencilfish and the Neon Tetra?
It comes down to look, size and pace rather than one being flatly better. The table above lays the numbers out row by row.