Species description

Care, breeding and tankmates

Fish profile

Temperament

Semi-aggressive

The Shining pencilfish is generally timid and easily frightened. They are a schooling species that feels most secure in groups of six or more. When kept in sufficient numbers, they exhibit fascinating social behaviors and more vibrant coloration.

Diet

Carnivore

It is a micro-predator that naturally feeds on tiny invertebrates and zooplankton. In the aquarium, it readily accepts crushed high-quality flakes and micropellets. Live or frozen foods like Daphnia and baby brine shrimp are highly recommended for optimal health.

Sex ratio

School

Males frequently display brighter colors and have a slimmer profile than females. Keeping a ratio of two or three females per male helps disperse mild male-to-male aggression. In larger schools, a balanced mix of sexes generally works well without intense conflict.

Feeding frequency

Twice daily

Due to their small digestive tracts, they should be fed small amounts multiple times a day. Offering food two to three times daily mimics their natural grazing behavior. Care must be taken not to overfeed, ensuring all food is consumed within minutes.

Bioload

The Shining pencilfish has a very low bioload impact on the aquarium. Its tiny size and modest appetite mean it produces minimal waste. This makes it an excellent candidate for heavily planted setups or smaller nano aquariums.

Flow

Stagnant

Nannostomus nitidus prefers gentle to moderate water flow. High-velocity currents can easily exhaust these small fish and cause chronic stress. Utilizing sponge filters or baffling the outflow of power filters is often beneficial.

Reproduction

Oviparous

Breeding this species is challenging and requires soft, acidic water conditions. They are egg scatterers that provide zero parental care after spawning. To save the fry, eggs must be moved to a separate rearing tank away from hungry adults.

Compatibility & tankmates

This species is extremely peaceful and works perfectly in community setups. It should only be housed with similarly sized, non-aggressive tankmates. Aggressive or large fish will easily intimidate or consume this delicate pencilfish.

Tank level

Top/Middle

They spend the majority of their time navigating the upper and middle levels of the water column. They love to hover among floating plants or tall stem plants. This top-dwelling behavior makes them a great contrast to bottom-dwelling species.