Skip to content
Fish Freshwater Care: medium Peaceful

African Red-eyed Tetra

Arnoldichthys spilopterus
— No votes yet Rate it
Other names: Arnold's red-eyed characin, Arnold's tetra
Group: Tetras and characins · Family: Alestidae · Origin: West Africa — southwestern Nigeria (Ogun River and Niger Delta)

An active West African tetra that stands out with its large, metallic-sheened scales and red upper eye. It needs plenty of swimming space and a covered tank.

Will it suit my tank?

Last updated October 16, 2026

Temperature
23–28°C
pH
6–7.5
Hardness
2–15 dGH
Adult size
9 cm
Minimum tank size
200 liters
Lifespan
5–8 years
Social structure
School
Group
at least 6, ideally 8+
Swimming zone
Middle
Diet
Omnivore
Breeding
Egg scatterer

Water parameters

Temperature23–28°C
pH6–7.5
General hardness (GH)2–15 dGH
Recommended range
May escape, needs a lid Considered shrimp safe Suitable for planted tanks

Overview

October 16, 2026 · Suggest an edit

The African red-eyed tetra is a West African species from the same family as the Congo tetra (Alestidae). Its large scales shimmer in blue, green and gold tones depending on the angle of the light; the lower half of the body is yellowish and the upper part of the eye is bright red. It is a fast swimmer that reaches 9–10 cm. Males have a more colorful anal fin with more distinct stripes.

Tank Setup

October 16, 2026 · Suggest an edit
  • At least 200 liters for a group of 6–8; 120 cm length.
  • 24–27°C, pH 6–7.5, soft to moderately hard water.
  • Plenty of open swimming space, plants along the edges and gentle to moderate flow.
  • It jumps when startled; a lid is required.

Diet

October 16, 2026 · Suggest an edit

Omnivorous. Flakes, granules, frozen bloodworms, brine shrimp and mysis shrimp are suitable. It mostly snaps up food in the middle and upper layers; 1–2 meals a day are enough.

Behavior and Compatibility

October 16, 2026 · Suggest an edit

A peaceful but active schooling fish. It is compatible with calm species of similar size; very small fish and baby shrimp may become prey.

Good companions: Congo tetras, medium-sized barbs, plecos, Synodontis species, peaceful West African cichlids such as kribensis.

Avoid: nano fish, dwarf shrimp, large aggressive cichlids.

A short profile for this species

The African Red-eyed Tetra page has the basics, but the sections below have not been written yet. If you keep this species, write a section from your own experience; it will be published under your name after editor approval.

Tank mates

This list is calculated automatically from the species profile and grows as new species are added to the catalog. Try it in the planner for a definite answer.

Usually compatible

Should not be kept together

Hobbyist notes

0 notes

Things you won't find in books, learned by trial and error. The most helpful ones are on top.

No notes yet. If you have experience with this species, leave the first note.
Change history and contributors
  1. Page created · October 16, 2026