Characidaefreshwater fishIntermediate

January Tetra

Hemigrammus hyanuary

Origin: Lago Hyanuary, Manaus, Brazil

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Water Parameters

Temperature2428 °C
15 °C35 °C
pH56.8
49
GH (Hardness)08 °dGH
0 °dGH30 °dGH
KH (Alkalinity)04 °dKH
0 °dKH20 °dKH

Quick Stats

Max Size
4.5 cm
Min Tank
80 L
Lifespan
4-6
Swimming Level
Middle
Schooling
Yes (8–20+)
Diet
Omnivore
Temperament
Peaceful; ideal for warm soft-water schooling community aquariums

About

Hemigrammus hyanuary, the January Tetra, originates from the Lago Hyanuary floodplain near Manaus in Brazil and is one of several members of the rummy-nose complex that are sometimes confused in the trade, though it is a biologically distinct species. Its red nose coloration is less extensive than Hemigrammus bleheri but still attractive, and it has an equally bold, well-defined tail stripe. It thrives in warm, soft, slightly acidic water and displays its best natural behaviour when kept in large schools of 8 or more.

Care Guide

House in groups of at least 8 in a well-planted aquarium (minimum 80 L). Maintain soft, slightly acidic water (pH 5.0–6.8, GH 0–8) at 24–28°C. Feed quality micro-pellets, flake, and small frozen foods: Artemia nauplii and Daphnia. Compatible with other warm, soft-water species: cardinal tetras, corydoras, and dwarf cichlids. Regular water changes maintain water quality and colour intensity.

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