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The emperor tetra is a placid aquarium fish and will be disturbed by more boisterous species. It grows to 4.2 cm. [3] It prefers a pH of 6.5, a hardness of 3–6 dKH and a temperature of 23–27 °C. It does not school as readily as most tetras, and a pair appears happier than with most tetras.
Black morpho tetras have successfully been kept in aquariums. [3] They prefer soft and acidic water parameters. They may have difficulty competing for food with more voracious tank mates. Although uncommon, the fish has been reported to have successfully been bred in captivity.
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It is kept as an aquarium fish where it is sold under the additional common names blue emperor tetra, purple emperor tetra, black emperor tetra, or regal tetra [4] (not to be confused with Nematobrycon palmeri with similar appearance and common names).
The black tetra is also known as the black skirt tetra. The female black tetra is more robust and larger than the male. [29] Black morpho tetra: Poecilocharax weitzmani: 4 cm (1.6 in) Bleeding heart tetra: Hyphessobrycon erythrostigma: 6.5 cm (2.6 in) The bleeding heart tetra is distinguished by the small red spot on both sides of the fish.
The Buenos Aires tetra are very durable, and do not have any special needs or requirements. A maintained freshwater tank and food is all that they really need. However, they are hearty feeders that must be well-fed or they may begin to nip at their long-finned tank-mates. Keeping the tetras in a school of 5 or more definitely decreases aggression.
The two described species in this genus are very popular aquarium fish. Species ... (rainbow tetra) Nematobrycon palmeri C. H. Eigenmann, 1911 (emperor tetra) References
Characidae, the characids or characins, is a family of freshwater subtropical and tropical fish belonging to the order Characiformes.The name "characins" is a historical one, [2] but scientists today tend to prefer "characids" to reflect their status as a, by and large, monophyletic group (at family rank).