Ruby Tetra (Axelrodia riesei) Care Guide

A tiny gem from Colombia with an intense deep ruby-red body coloration that seems to glow under aquarium lighting.

Overview

Axelrodia riesei is a species in the family Characidae. A tiny gem from Colombia with an intense deep ruby-red body coloration that seems to glow under aquarium lighting. One of the smallest tetras available, it thrives in mature, heavily planted tanks with dark substrate and tannin-stained water that enhances its vibrant color. Shy at first but becomes bold in larger schools.

Taxonomy

Family: Characidae
Genus: Axelrodia
Scientific name: Axelrodia riesei
Other names: Axelrodia riesei
Origin: South America

Habitat

Endemic to the Río Meta and Río Manacacías drainages of the upper Orinoco basin in Colombia. Inhabits soft, acidic, slow-flowing forest streams. A tiny characin that displays a deep ruby-red colouration in mature, well-conditioned specimens.

Tank requirements

Minimum tank volume: 30 L
Temperature: 22-27 °C
pH: 4.5-6.5
GH: 1-6 °dGH
Water flow: low
Adult size: 1.5-2 cm
Lifespan: 2-4 years
Recommended group size: ≥ 10
Difficulty: intermediate

Diet

Classified as omnivore. Recommended feeding frequency: 2x daily. In captivity, offer a varied diet appropriate to the species — quality prepared foods supplemented with frozen or live items of suitable size.

Compatibility

Temperament: peaceful
Swimming level: middle
Compatible tank mates: Ember Tetra, Pygmy Corydoras, Otocinclus, Cherry Shrimp, Other nano tetras
Avoid with: Any fish large enough to eat them, Fast aggressive feeders

Breeding

Breeding strategy: egg-scatterer
Breeding difficulty: advanced