January Tetra (Hemigrammus hyanuary)

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January Tetra

Hemigrammus hyanuary-4535.jpg
January Tetra

Hemigrammus hyanuary

57 Litres (15 US G.)

4.1-4.3cm (1.6-1.7 ")




6.0 - 7.5

23 -27 °C (73.4-80.6°F)

5-15 °d

1:2 M:F

Pellet Foods
Flake Foods
Live Foods

3-5 years



Additional names

January Tetra, Costello Tetra


The female is more full and rounded in the belly than males. The male has a small hook on its anal fin. This is not always easy to see.

Tank compatibility[edit]

A peaceful shoaling community fish that should be kept in groups of 6 or more. Keep with other peaceful community fish.


Will accept most foods including pellet and flake as well as live/frozen food such as daphnia, brine shrimp and bloodworm.

Feeding regime[edit]

Feed once or twice a day.

Environment specifics[edit]

Prefers a densely planted tank with dark substrate and floating plants and some open swimming space.


An active peaceful shoaling fish.


An elongate slender Tetra which is pale in base colour with a vivid bright yellow lateral line from the gills to the caudal peduncle. At the caudal peduncle there is a large black dot. The caudal fin itself is sharply forked and and the fins are mainly translucent with a slight yellow tint.

Conservation Status[edit]

According to the IUCN Red List, the Costello Tetra is a species of least concern and has a stable population.


External links[edit]