Common Name(s)
Firehead tetra, common rummy-nose tetra
Scientific Name
Hemigrammus bleheri
Family
Characidae
Origin
Negro and Meta river basins
Temperament
Peaceful
Maximum Size
2 inches
Minimum Tank Size
15/20 gallon with minimum base dimensions of 24 x 12
Tank Setup
Looks best in a planted tank with a dark substrate and background.
Tank Region
Middle-top
Diet
Omnivore. Will take dry foods, but supplement with mosquito larvae and other live foods.
Breeding
Egg-scatterer. Doesn't take care of its young.
Compatibility
With other temp-compatible community fish
Ease of Keeping
Fairly easy
Care
pH: Doesn't matter; Temperature: 74-79 Fahrenheit
Brilliant_rummy_nose.jpg

By Lerdsuwa - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=517139

This species is closely related to the other rummy-nose tetra, H. rhodostomus. The two are often confused. This picture will help:
tfh_rummynose_tetras.jpg

Credit: http://www.peteducation.com/article.cfm?c=16+1955&aid=2546
As you can see, H. bleheri does not have the black lateral line near the tail end of the fish. H. bleheri also has the red color extend pass its gill cover while the other two do not.
For other differences, follow the link above.
This species is the most commonly found in the hobby of the three.

A schooling fish, so should be kept in groups of 6+ of its own species.

Females are more round than males.