Common name: Purple Pencilfish.
Species: Nannostomus rubrocaudatus.
Habitat: Western Peru, near the foothills of the Andes mountains.
Potential size: 3cm.
Social behaviour: Generally a peaceful community fish. Rival males are territorial with one another but in a heavily planted aquarium any issues can usually be avoided.
Food: Flake, granules, frozen food, live food etc.