Species profile
Emperor Tetra
Nematobrycon palmeri
Peaceful
Easy care
80 L minimum aquarium
4–5 cm adult size
Midwater
Minimum group: 8
About this species
General notes for hobby use.
Peaceful shoaling tetra; adult males display and spar but serious aggression is unusual with adequate space and group structure.
Water parameters
Suggested general range for long-term care.
Temperature
23–27 °C
pH
5.5–7.8
GH
Up to 20 dGH
KH
Not yet documented
Flow preference
Low–moderate
Data confidence
Verified
Behaviour
General behaviour traits used by TanksConnected compatibility checks.
Minimum group size
Minimum group: 8
Tank zone
Midwater
Territory level
Low
Predation risk
Tiny fry
Bioload factor
0.7
Males may establish temporary display stations. Keep several of both sexes and provide plant cover plus open swimming space.
Compatibility flags
Quick cautions for common tank-planning issues.
Fin nipper
No
Plant safe
Yes
Shrimp safe
Yes
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
80 L
Minimum footprint
80 × 35 cm
Accepted scientific name
Nematobrycon palmeri
Alternative names
Emperor Tetra
Native range
Western Colombia, especially the San Juan and Atrato drainage region.
Natural habitat
Slow forest streams and tributaries with vegetation, roots and shaded margins.
Diet & feeding
Takes worms, crustaceans and small insects; accepts good prepared foods supplemented with frozen/live fare.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Males develop more extended dorsal/anal/caudal fin rays and a stronger blue iris; females are typically fuller.
Breeding
Egg scatterer with no parental care; adults may eat eggs.