Coral-red dwarf pencilfish

Introduction

The Coral-red dwarf pencilfish (Nannostomus mortenthaleri) is a captivating freshwater species cherished by aquarists for its vibrant red coloration and peaceful demeanor. Native to the Amazonian waterways of Peru, this small fish adds a splash of color and dynamic activity to well-planted aquariums. Its manageable size and relatively straightforward care requirements make it an excellent choice for both novice and intermediate fishkeepers.

What makes the Coral-red dwarf pencilfish a popular choice among aquarists?

Its striking red hues and gentle nature make it a standout addition to community tanks, especially those designed to mimic natural, planted environments.

Is this species suitable for beginners?

Yes, with proper attention to water parameters and tank setup, the Coral-red dwarf pencilfish is well-suited for beginners seeking a vibrant and peaceful fish.

Care and Environment

Providing optimal care for the Coral-red dwarf pencilfish involves replicating its natural habitat and maintaining stable water conditions. A minimum tank size of 40 liters is recommended, though a larger aquarium of 60 liters or more is ideal for housing a group, promoting natural shoaling behavior and reducing stress.

Water parameters should be carefully monitored: maintain a temperature between 24°C and 28°C, a pH range of 5.5 to 7.0, and soft water with a hardness of 2 to 12 dGH. Gentle filtration is essential to avoid strong currents, as these fish prefer calm waters. Subdued lighting, achieved through the use of floating plants, can help replicate their natural environment and enhance their coloration.

In terms of diet, the Coral-red dwarf pencilfish is an omnivore with a preference for small live and frozen foods such as brine shrimp, daphnia, and bloodworms. High-quality flake or micro pellet foods can also be included to ensure a balanced diet. Feeding small portions twice daily is recommended to maintain health and vibrancy.

Decorating the tank with dense vegetation, driftwood, and leaf litter not only provides hiding spots but also mimics their natural habitat. A dark substrate can further accentuate their vivid colors. It's important to ensure that the tank is well-covered, as these fish are known to jump when startled.

How many Coral-red dwarf pencilfish should be kept together?

It's advisable to keep them in groups of at least six to promote natural behavior and reduce stress.

Can they adapt to different water conditions?

While they prefer soft, slightly acidic water, they can adapt to a range of conditions within the specified parameters, provided changes are made gradually to avoid stress.

What are common challenges in caring for this species?

They can be sensitive to sudden changes in water conditions and lighting. Ensuring stable parameters and a well-planted environment can mitigate these issues.

Origin and Habitat

The Coral-red dwarf pencilfish is indigenous to the slow-moving streams and densely vegetated areas of the Amazon Basin in Peru. These environments are characterized by soft, acidic waters rich in leaf litter, providing ample hiding spots and a natural diet of small invertebrates.

In their natural habitat, they thrive in calm waters with minimal flow, surrounded by dense aquatic vegetation and submerged roots. The presence of leaf litter not only offers shelter but also contributes to the slightly acidic pH of the water, a condition they are well-adapted to.

What type of water bodies do they inhabit?

They are typically found in slow-moving streams and tributaries with dense vegetation and soft, acidic water conditions.

How does their natural environment influence their care in captivity?

Replicating their natural habitat in the aquarium, with soft, acidic water, dense planting, and minimal water flow, is crucial for their well-being and stress reduction.

Temperament and Compatibility

The Coral-red dwarf pencilfish is known for its peaceful nature, making it an excellent candidate for community aquariums. They are shoaling fish and exhibit their best behavior and coloration when kept in groups of six or more.

While generally peaceful, males may display mild aggression towards each other, especially during breeding periods. This behavior is typically limited to fin-nipping within their group and does not usually extend to other tank mates.

Suitable tank mates include other small, non-aggressive species such as small tetras, rasboras, and dwarf cichlids. It's advisable to avoid housing them with larger or more aggressive fish that might intimidate or outcompete them for food.

Are they suitable for community tanks?

Yes, their peaceful nature makes them well-suited for community tanks with other small, non-aggressive species.

Do they require specific tank mates?

They thrive with similarly sized, peaceful fish. Avoid pairing them with larger or aggressive species to prevent stress and competition.

How do they interact with their own species?

They are social and prefer to be in groups, though males may exhibit mild aggression towards each other, especially during breeding times.

Interesting Facts

The Coral-red dwarf pencilfish was scientifically described relatively recently, in 2001, highlighting its unique characteristics and appeal to aquarists.

In the wild, they are micro-predators, feeding on small invertebrates and zooplankton. This diet contributes to their vibrant coloration, which can be enhanced in captivity by providing a varied and protein-rich diet.

Breeding this species in captivity can be challenging due to their sensitivity to lighting and water conditions. Males change to a purplish hue when ready to breed, and providing a dedicated breeding tank with soft, slightly acidic water and fine-leaved plants can encourage spawning.

What contributes to their vibrant coloration?

A diet rich in live and frozen foods, such as brine shrimp and bloodworms, helps maintain and enhance their natural red hues.

Why is breeding them in captivity considered challenging?

Their sensitivity to environmental changes, particularly in lighting and water parameters, makes breeding a delicate process requiring specific conditions.

How can their natural diet be replicated in captivity?

Offering a variety of small live and frozen foods, along with high-quality flake or pellet foods, can closely mimic their natural feeding habits.

Sources

All information in this article has been gathered from the following reputable sources:

• aqua-fish.net
• nafb.ca
• aquajoy.club