Species description

Care, breeding and tankmates

Fish profile

Temperament

Semi-aggressive

They are peaceful, somewhat delicate fish that require a calm and stable environment. While males spar harmlessly, they never cause actual damage to one another. They display their best behaviors and colors when feeling secure among dense plants.

Diet

Omnivore

They are omnivorous micro-predators that eagerly accept most appropriately sized aquarium foods. High-quality flakes, micro-pellets, and frozen bloodworms or daphnia make up a great diet. Providing a varied menu is key to maintaining their vibrant stripes.

Sex ratio

School

A mixed group of both sexes in a school of six or more is highly recommended. Males are generally more slender and colorful, often displaying to each other. Keeping more females than males can help diffuse any mild bickering.

Feeding frequency

Twice daily

Feeding them one to two times daily with small amounts is optimal. They are methodical eaters, so ensure food remains accessible long enough for them. Careful observation prevents them from being outcompeted by greedier tank mates.

Bioload

Harrison's Pencilfish produces a relatively low bioload despite being slightly larger. They are efficient processors of small foods, creating minimal excess waste. Standard filtration systems are perfectly adequate to maintain high water quality.

Flow

Stagnant

They prefer slow to moderate water currents, avoiding highly turbulent areas. Gentle circulation from a spray bar or a low-flow filter suits them perfectly. Too much flow forces them to hide and expends their energy needlessly.

Reproduction

Oviparous

Breeding requires a dedicated, dimly lit setup with very soft and acidic water. They are egg scatterers that deposit their eggs among fine-leaved plants. Parents must be removed immediately after spawning to prevent egg cannibalism.

Compatibility & tankmates

They are peaceful schooling fish that thrive in quiet, planted community aquariums. Ideal companions are similarly sized peaceful species like corydoras and small rasboras. Fast-swimming, aggressive feeders should be avoided as they will induce stress.

Tank level

Top/Middle

They generally cruise the middle to upper levels of the water column. Their sleek, torpedo-like bodies are adapted for hovering near tall vegetation. They rarely interact with the bottom substrate unless chasing a sinking morsel.