Species profile
African Red-eye Tetra
Arnoldichthys spilopterus
Peaceful
Easy care
180 L minimum aquarium
8–10 cm adult size
Midwater
Minimum group: 8
About this species
General notes for hobby use.
Large, active African tetra; much better in a substantial shoal than the traditional bare minimum of six.
Water parameters
Suggested general range for long-term care.
Temperature
23–28 °C
pH
6–8
GH
5–19 dGH
KH
Not yet documented
Flow preference
Moderate
Data confidence
Verified
Behaviour
General behaviour traits used by TanksConnected compatibility checks.
Minimum group size
Minimum group: 8
Tank zone
Midwater
Territory level
None
Predation risk
Tiny fry
Bioload factor
1.2
Peaceful, energetic shoaler. Avoid timid or very slow tankmates and give the group ample uninterrupted swimming length.
Compatibility flags
Quick cautions for common tank-planning issues.
Fin nipper
No
Plant safe
Yes
Shrimp safe
No / caution
Snail safe
Yes
Cave breeder
No
Digs substrate
No
Jump risk
Yes
Natural history & care
Research-backed context for long-term aquarium care.
Lifespan
Not yet documented
Diet type
Omnivore
Minimum aquarium volume
180 L
Minimum footprint
100 × 40 cm
Accepted scientific name
Arnoldichthys spilopterus
Alternative names
African Red-eye Tetra, Niger Tetra
Native range
Lower Niger and Ogun river systems in Nigeria.
Natural habitat
A 100 cm+ aquarium with open swimming area, darker margins and clean, moderately moving water suits this active species.
Diet & feeding
Quality dry foods supplemented with worms, insects and small crustacean foods.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Males are typically slimmer and more strongly coloured; females are fuller-bodied.
Breeding
Prolific egg-scatterer; breeders may release many eggs among fine plants or mops. Remove adults to protect eggs.