January tetra

Care at a glance

Overview

Keep a school of six or more in a tank around 65 liters and they will hold the middle to upper water. They are peaceful and active, and a proper group keeps them calm and colored up. Feed small flake, micro-pellets, and the occasional frozen brine shrimp or daphnia. They suit a planted soft-water community alongside other small, gentle fish.

In the wild

The January tetra comes from calm, shallow Amazon waters in Peru and Brazil, including the Lago do Januari area near Manaus that gives it its name. These are soft, slightly acidic, shaded spots over sand or mud, rich in plants and biofilm. Match that with a dim, well-planted tank, soft water, and a pH from the mid 5s to about 7. Botanicals and a darker substrate help show off the fish.

Good to know

Hemigrammus hyanuary is a characin (family Characidae) reaching roughly 4 cm. It has a slim, silvery body with a dark stripe and a small gold or green mark near the tail. It is an egg scatterer that gives no parental care, with eggs hatching in about a day to a day and a half. It is listed as Least Concern with stable wild numbers.

Common questions

Related species

• 

  Glowlight tetra

  Hemigrammus erythrozonus

  1.6 in (4 cm) · 18 gal (70 L)

  1.6 in (4 cm)18 gal (70 L)75–82°F (24–28°C)

• 

  Filament tetra

  Hemigrammus filamentosus

  1.7 in (4.3 cm) · 20 gal (75 L)

  1.7 in (4.3 cm)20 gal (75 L)75–82°F (24–28°C)

• 

  Ulrey's tetra

  Hemigrammus ulreyi

  1.7 in (4.4 cm) · 20 gal (75 L)

  1.7 in (4.4 cm)20 gal (75 L)72–81°F (22–27°C)

• 

  Garnet tetra

  Hemigrammus pulcher

  1.8 in (4.5 cm) · 20 gal (75 L)

  1.8 in (4.5 cm)20 gal (75 L)73–82°F (23–28°C)

• 

  Head-and-taillight tetra

  Hemigrammus ocellifer

  1.8 in (4.5 cm) · 17 gal (65 L)

  1.8 in (4.5 cm)17 gal (65 L)75–82°F (24–28°C)

• 

  Collett's tetra

  Hemigrammus collettii

  2 in (5 cm) · 20 gal (75 L)

  2 in (5 cm)20 gal (75 L)73–82°F (23–28°C)