Species description

Care, breeding and tankmates

Fish profile

Temperament

Aggressive

They possess a docile and somewhat timid temperament, relying heavily on their school for confidence. A group of six is the absolute minimum, but larger schools of ten or more are strongly recommended. When kept properly, they are active, fascinating fish to observe.

Diet

Omnivore

In their natural habitat, they are micropredators feeding on tiny aquatic insects and zooplankton. In captivity, they easily transition to high-quality dry flakes and micro-pellets. Supplementing with small live or frozen foods, such as daphnia, will promote the best coloration and health.

Sex ratio

School

Maintaining a balanced ratio of males to females is best for group harmony. While males may display and spar harmlessly, injuries are exceptionally rare. A sufficiently large group size ensures any minor squabbles are diluted among the school.

Feeding frequency

Twice daily

They should be fed two small meals daily, offering only what they can consume in a few minutes. Frequent, small feedings mimic their continuous foraging habits in the wild. This practice also prevents excess food from spoiling the water quality.

Bioload

This small tetra creates a negligible bioload, making it suitable for heavily planted or smaller community setups. When kept in standard schooling numbers, their waste output places very little strain on the biological filter. Regular weekly maintenance is typically sufficient to keep parameters in check.

Flow

Stagnant

They prefer slow-moving waters akin to their native South American streams and oxbow lakes. High-flow environments will cause them to struggle and eventually succumb to exhaustion. Sponge filters or baffled HOB filters provide the ideal gentle circulation.

Jump risk

Yes

There is a mild risk of jumping if the fish are startled by sudden lights or loud noises. A secure aquarium lid is highly recommended to prevent any accidental jumping. Including floating plants makes them feel secure, reducing the likelihood of startled leaps.

Reproduction

Oviparous

Like other Hemigrammus species, they scatter their eggs among fine-leaved aquatic vegetation. They do not protect their young and will actively eat their own eggs if given the chance. A separate, dimly lit breeding tank with a mesh floor or dense moss is required to save the eggs.

Compatibility & tankmates

A highly peaceful species that interacts amicably with other gentle community fish. They pair well with small rasboras, pencilfish, and bottom-dwelling catfish like Corydoras. They should not be mixed with fin-nipping species or large carnivorous fish.

Tank level

Middle/Bottom

They are predominantly mid-water swimmers, rarely venturing to the very top or bottom of the tank. They prefer to school in open areas that are closely bordered by dense plant growth. They use these planted areas as immediate retreats if they feel threatened.