http://elmlaneaquatics.com/fish/tropical/

There are dozens of different species of fish known as tetras, in all shapes and sizes.  The name tetra comes from Greek for four, which refers to the fish having four fins.   Varying kinds of tetras come from South America and West Africa; they tend to be shoaling fish and prefer to live in groups of five or six or more.  Most will happily coexist with a range of other community fish, are relatively hardy and easy to feed.  Some may even breed, scattering eggs in among your plants.  Most prefer softish water with a pH of 6 – 7.5 and temperature around 24 – 27C.

Penguin

X-Ray

Black Widow

Neon

Diamond

Emperor

Cardinal

Rummy Nose

Lemon

Black Neon

Glowlight

Silvertip

Serpae

Rosy

Beacon

Albino Glowlight

Buenos Airies

Flame

Ember

Red-Eyed

Glass Bloodfin

Black Phantom

Congo

Blue

Columbia

Pink Tailed Chalveus

Rathbuni

Bleeding Heart

Golden Pencil