How do I tell the difference between male and female Emperor Tetras?

Males are larger, display a longer, trident-like extension on their tail fin, and have metallic blue eyes. Females are plumper, have standard forked tails without the central extension, and possess green eyes.

Why are my Emperor Tetras chasing each other?

It is completely normal for males to engage in mock battles and chase one another. They do this to establish a pecking order and a small territory to attract females. As long as the tank is spacious and the group is large enough, no real harm will come of it.

How many Emperor Tetras should I keep together?

They are a shoaling species and should be kept in a group of at least six, though larger groups of 10 or more are highly recommended to disperse male aggression and encourage natural schooling behaviour.

Are Emperor Tetras fin nippers?

Generally, no. While the males may occasionally spar with one another, they are peaceful towards other species and are highly unlikely to nip the fins of their tankmates.

Do Emperor Tetras need a planted tank?

While not strictly required for survival, a planted tank is highly recommended. Dense vegetation provides the security they need to behave naturally, and a darker, planted environment will bring out their best iridescent colours.

FreshwaterTropicalBeginner

Emperor Tetra

Nematobrycon palmeri

The Emperor Tetra is a robust and visually striking community fish renowned for the male's metallic purple sheen and unique trident-shaped tail.

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Ideal Conditions

Temperature: 23 – 27 °C
pH range: 5 – 7.5
Hardness: 1 – 12 dGH
Adult size: 4 – 5 cm
Min. volume: 70 litres+
Lifespan: 4 – 6 years
Diet: Omnivore
Water flow: Gentle to moderate
Preferred setup: Densely planted aquarium with dark substrate, driftwood, and scattered leaf litter. Provide open swimming space in the centre.

About the Emperor Tetra

Hailing from the dense rainforests of western Colombia, the Emperor Tetra (*Nematobrycon palmeri*) brings elegance and activity to the community aquarium. They exhibit fascinating sexual dimorphism; males grow larger and develop an extended central tail ray, resulting in a distinct trident appearance. Furthermore, males possess brilliant metallic blue eyes, whereas females feature vibrant green eyes. These subtle yet beautiful characteristics make them highly sought after by aquarists looking for something more substantial than the typical neon tetra.

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Is it right for your tank?

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Where Emperor Tetra comes from

Native range

San Juan River basin, Atrato River basin

Countries / regions

Colombia

Habitat

Slow-moving forest streams, small tributaries, and the margins of larger rivers with dense overhanging vegetation.

Primarily endemic to the Chocó region of western Colombia.

Similar species

Rainbow Tetra
Nematobrycon lacortei
Congo Tetra
Phenacogrammus interruptus
Kerri Tetra
Inpaichthys kerri

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Bronze Corydoras
Corydoras aeneus
Peaceful, active bottom dwellers that occupy a completely different water stratum and share similar environmental needs.
Great
Cardinal Tetra
Paracheirodon axelrodi
Highly compatible schooling companions that enjoy the same soft, acidic water conditions and will not compete aggressively for food.
Great
Cockatoo Dwarf Cichlid
Apistogramma cacatuoides
Emperor Tetras act as excellent dither fish for dwarf cichlids, making them feel secure while posing no threat to adult cichlids.
Great
Freshwater Angelfish
Pterophyllum scalare
While adult Emperor Tetras are often deep-bodied enough to avoid being eaten, large adult Angelfish may opportunistically prey on smaller individuals.
Compatible with caution
Tiger Barb
Puntigrus tetrazona
Tiger Barbs are notoriously boisterous and prone to fin-nipping, which would cause significant stress and physical damage to the Emperor Tetra's trailing fin extensions.
Not recommended

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