Red eye tetra (Moenkhausia sanctaefilomenae)

Family: Characidae

Red eye tetra — a Characidae from South AmericaSouth America, peaceful mid-water shoaler; confidence comes in numbers. Reaches 2.7–4 cm; groups of 8 minimum; more is visibly better. 23–27 °C.

Care parameters

Water temperature
23–27 °C
pH
5.5–7.5
GH hardness
5–12 dGH
Adult length
2.7–4 cm
Minimum tank
25 L
Water layer
Middle of the water column
Difficulty
Moderate
Temperament
Peaceful mid-water shoaler; confidence comes in numbers
Origin
South America

Species overview

A Characidae species native to South America: Moenkhausia sanctaefilomenae lives middle of the water column over blackwater streams and flooded forest. Peaceful mid-water shoaler; confidence comes in numbers. Adults reach 2.7–4 cm. It is one of the aquarium-kept Moenkhausia species we profile, alongside Moenkhausia pittieri.

Native biotope

Habitat
Blackwater streams and flooded forest
Flow
Still to gentle current
Dissolved O₂
Moderate

Aquascape & hardware

Substrate
Dark sand and leaf litter
Hardscape
Driftwood and dense plant edges
Plants
Floating and shaded plants appreciated

Temperament, diet & tankmates

Schooling
Groups of 8 minimum; more is visibly better
Diet
Small omnivore; quality flakes and small frozen foods
Recommended tankmates
  • Small Corydoras — Share the lower water peacefully
Avoid keeping with
  • Large or predatory fish — Tetras are snacks

Breeding & notes

Sexual dimorphism
Subtle; females fuller-bodied
Breeding method
Typical egg-scattering characin; adults eat the eggs

Frequently asked questions

Is Red eye tetra easy to keep?

Difficulty: moderate. Peaceful mid-water shoaler; confidence comes in numbers. Groups of 8 minimum; more is visibly better.

What temperature and water chemistry does Red eye tetra need?

Set the heater to 23–27 °C and avoid swings. pH 5.5–7.5, GH 5–12 dGH suit it.

How big does Red eye tetra get, and what tank size?

Expect 2.7–4 cm as an adult, living middle of the water column. A 25 L tank or larger gives it room.

What does Red eye tetra eat?

Small omnivore; quality flakes and small frozen foods. It forages naturally over dark sand and leaf litter, so let some food reach the bottom.

Can Red eye tetra live with other fish?

Peaceful mid-water shoaler; confidence comes in numbers. Recommended tankmates: Small Corydoras — Share the lower water peacefully. Avoid Large or predatory fish — Tetras are snacks.

Where does Red eye tetra come from?

Native to South America, where it lives in blackwater streams and flooded forest. Still to gentle current; Moderate.

Does Red eye tetra jump?

Not a noted jumper — a standard cover still keeps dust and spray in.

How does Red eye tetra breed?

Typical egg-scattering characin; adults eat the eggs. Subtle; females fuller-bodied.