One-Lined Pencilfish
Nannostomus unifasciatus
One-Lined Pencilfish is a peaceful middle-to-top swimmer.
Save this fish or add it directly to one of your aquariums.
Quick facts
- Adult size
- ≤ 7 cm (≤ 2.8 in)
- Aquarium size
- 60 L or larger
- Care level
- Beginner – Intermediate
- Temperament
- Peaceful
- Swimming zone
- Middle to top swimmer
- Temperature
- 23–28 °C
- pH
- 4–7
- GH
- 2–12 dGH
- Diet
- Omnivore
- Lifespan
- up to 5 years
Care requirements
Care level: Beginner – Intermediate.
Lifespan: up to 5 years.
Aquarium size and space needs
Minimum aquarium size: 60 L or larger. Plan the layout and stocking within that limit.
Water parameters
Suitable water: temperature 23–28 °C, pH 4–7, GH 2–12 dGH.
Temperament and compatibility
One-Lined Pencilfish is peaceful and suits calm community fish.
Swimming zone and behavior
This fish uses the middle to upper part of the aquarium, so leave enough open swimming space for movement and feeding.
Feeding
As an omnivore, One-Lined Pencilfish should receive a varied diet rather than one repeated food type.
Before adding this fish
- Plan for an aquarium of 60 L or larger.
- Avoid aggressive or highly competitive fish.
- Offer a varied diet that matches this species.
Similar fish profiles
Use these profiles to compare fish with similar care level, size, temperature range, or swimming behavior.
FAQ
How large does One-Lined Pencilfish get?
One-Lined Pencilfish reaches ≤ 7 cm (≤ 2.8 in).
What aquarium size does One-Lined Pencilfish need?
Use an aquarium of at least 60 L or larger.
Is One-Lined Pencilfish peaceful?
Yes. One-Lined Pencilfish is recorded as peaceful and is best planned with calm community fish that do not harass it or dominate the feeding area.
What temperature is suitable for One-Lined Pencilfish?
Keep it between 23 to 28 °C.