Dwarf pencilfish
Nannostomus marginatus
FishFreshwater
The dwarf pencilfish (Nannostomus marginatus) is a tiny fish of the family Lebiasinidae. It reaches only 3.5 cm. Its body is elongated with a horizontal black stripe and a red or golden stripe above. Fins are often transparent with red spots. It is a very shy schooling fish that must be kept in groups of at least 8 to 10. It prefers very soft acidic water typical of blackwater. It feeds on very small foods.
Recommended parameters
| Parameter | Recommended range |
|---|---|
| Temperature | 24–28 |
| pH | 4.5–6.5 |
| GH | 1–5 |
| KH | 0–3 |
| NO₃ | ≤ 10 |
| PO₄ | ≤ 0.2 |
Care
Difficulty3/5
Dietcarnivore
Min. tank30 L
Min. group8
Adult size3.5 cm
Lifespan3 ans
Temperamentpeaceful
Care notes
Nano tank of at least 30 L. Temperature 24-28°C, pH 4.5-6.5, GH 1-5. Blackwater (peat, catappa leaves). Fine plants, subdued lighting. Diet: infusoria, microworms, brine shrimp nauplii. Very regular water changes with RO water. Delicate fish for experienced aquarists.