Espei Pencilfish

Nannostomus espei

📍 South America

The Espei Pencilfish is a small, slender freshwater fish native to South America, known for its elegant elongated body and peaceful demeanor. These fish are excellent for nano and planted aquariums, displaying active schooling behavior in groups. They are relatively hardy and make an ideal choice for beginner to intermediate aquarists seeking a unique, community-friendly species.

Size1.2"

Min Tank10g

School6+

peaceful

Zonemiddle

Care Guide

Diet

Espei Pencilfish are omnivores that prefer small live foods such as micro worms, daphnia, and brine shrimp. Supplement with high-quality micro pellets and finely crushed flake food. Feed small amounts 2-3 times daily, offering only what they can consume in a few minutes.

Behavior

These fish are active schoolers that display best behavior when kept in groups of at least 6 individuals. They are peaceful and non-aggressive, spending most of their time in the middle water column. They exhibit natural schooling patterns and are most active during dawn and dusk hours.

Breeding

Breeding Espei Pencilfish in captivity is moderately difficult and requires soft, acidic water conditions (pH 5.5-6.5) and dense vegetation or spawning mops. Females will scatter eggs among plants, and parents should be removed after spawning to prevent egg predation. Fry are extremely small and require infusoria or liquid fry food initially.

Tank Mates

Neon Tetra

Similar size and peaceful temperament, thrive in same water conditions

excellent

Cardinal Tetra

Compatible schooling fish with identical care requirements

excellent

Otocinclus

Peaceful bottom dweller that won't compete for food or space

excellent

Amano Shrimp

Peaceful invertebrate that helps with algae control and won't harm pencilfish

good

Java Fern

Provides shelter and natural environment without being uprooted by these gentle fish

excellent

Common Diseases

Ich (Ichthyophthirius multifiliis)

Symptoms

White spots on body and fins, rapid breathing, lethargy, rubbing against objects

Treatment

Increase water temperature gradually to 28-30 C (82-86 F), perform daily 25% water changes, use aquarium salt at recommended doses, or treat with copper-free ich medication

Fin Rot

Symptoms

Frayed or deteriorating fins, discoloration at fin edges, lethargy

Treatment

Perform 25-50% water changes every 2-3 days, maintain excellent water quality, use antibacterial medication if severe, remove any sharp decorations

Columnaris (Flexibacter columnaris)

Symptoms

White or gray film on body, mouth rot, rapid gill movement, loss of appetite

Treatment

Isolate affected fish, perform daily 50% water changes, treat with antibacterial medication, maintain water temperature at 24-26 C (75-79 F)

Neon Tetra Disease

Symptoms

Loss of coloration, curved spine, lethargy, erratic swimming behavior

Treatment

No cure available; isolate affected fish to prevent spread, maintain pristine water conditions, euthanize severely affected individuals to prevent transmission to healthy fish