Nitindus Pancelfish (Nannostomus nitidus) — XL

Overview

The Nitidus Pencilfish (Nannostomus nitidus) is a delicate, peaceful dwarf pencilfish that shines in a planted, softly lit nano community aquarium. Native to the Amazon Basin in South America, this species (adult size around 4.5 cm) thrives in soft, slightly acidic water and rewards aquarists with graceful swimming behaviour, moderate care requirements, and subtle beauty. Ideal for planted nano aquariums or specialist softwater communities.

Appearance

Nannostomus nitidus displays a slender, pencil-shaped body with subtle coloration ranging from pale golden-beige to olive, often with darker horizontal stripes and subtle iridescent highlights. The body is streamlined and delicate, with small, well-proportioned fins. Males are slightly more intensely coloured than females, especially during spawning. The overall appearance is understated but elegant, typical of dwarf pencilfish species.

Natural Habitat

This species inhabits slow-flowing rivers, streams, and flooded forest areas across the Amazon Basin in South America. Exact locality details are not well documented in the aquarium trade. The natural environment is characterised by soft, slightly acidic water, warm temperatures, dense vegetation, submerged wood, and leaf litter. In the wild, Nitidus Pencilfish forage among plants and debris, feeding on small invertebrates, insect larvae, and microorganisms.

Aquarium Setup

Recreate a South American biotope with a mature, well-planted aquarium featuring live plants (such as Java moss, Java fern, Cryptocoryne), driftwood, and open swimming areas. Use a dark sandy substrate and subdued lighting to reduce stress and bring out natural colours. Ensure stable water chemistry: pH 5.5–7.0, soft water (GH 2–8°), and a temperature of 24–28°C. A minimum of 60 litres is recommended for a small group. Provide gentle filtration to avoid strong currents, regular water changes, and plenty of cover.

Water Parameters

Nitidus Pencilfish are sensitive to poor water quality and stress, thriving best in soft, clean water. Aim for 24–28°C, pH 5.5–7.0, and soft water. Conduct weekly partial water changes (20–30%) to maintain low nitrate levels and replenish essential minerals. Use a high-quality filter with gentle flow, and consider adding driftwood or Indian almond leaves to naturally acidify and tannin-stain the water. Monitor parameters closely, as fluctuations can stress these delicate fish.

Feeding

In the wild, Nannostomus nitidus feeds on small live invertebrates and microorganisms. In captivity, offer small live and frozen foods such as daphnia, baby brine shrimp, microworms, and finely chopped insect-based foods. Will also accept quality micro pellets or flakes once acclimated. Feed small portions once or twice daily. A balanced diet supports healthy growth and natural behaviour.

Behaviour

This species is peaceful and delicate, best kept in small groups in a mature, well-planted aquarium. Nitidus Pencilfish are slow-moving, graceful swimmers that spend much of their time foraging among plants and driftwood. They are non-aggressive and make ideal nano community fish, coexisting peacefully with other small, peaceful species. Sensitive to poor water quality and stress, so provide plenty of cover and a quiet, stable environment.

Tank Mates

Suitable companions include small peaceful tetras (e.g., Ember, Green Neon), rasboras, dwarf corydoras, small peaceful pencilfish, and Otocinclus. Avoid large fish, aggressive fish, fin-nippers, predatory fish, or boisterous species. Careful planning and proper shoal sizes ensure a harmonious South American nano community.

Breeding

Nitidus Pencilfish spawn in soft, acidic water with fine-leaved plants or spawning mops. Adults may eat eggs, so a separate breeding tank is recommended. Fry require very small live foods such as infusoria or liquid fry food, graduating to newly hatched brine shrimp as they grow. Maintain excellent water quality and stable conditions to support successful breeding.

Why Buy from Tropical Fish Co

Tropical Fish Co is a leading UK specialist in South American tetras and pencilfish for sale, offering healthy, quarantined species including the delicate Nitidus Pencilfish. Every fish is carefully selected, acclimated to our expert holding systems, and dispatched with detailed care guidance. Whether you're building your first planted nano community or adding to an established aquarium, our knowledgeable team is here to support your success. Order online today for fast, reliable delivery and discover why Tropical Fish Co is the trusted choice for premium freshwater fish for sale UK.