Growing to a maximum length of 5.5cm (2.2in) in total length, The Blue tetra has a blue and pink colour, The temperature preference to about 22–27°C (71.6–80.6°F) and the pH preference is 6 to 7.5 pH. The hardness preference is about Soft to medium (less than 15ºd), and the salinity preference is No salt. The compatibility is Generally peaceful, may nip fins during feeding or when stressed. Its lifespan is typically 2 to 3 years. Ease of keeping is easy, and the ease of breeding is very hard.
As for other schooling characins, the cochu's blue tetra should always be kept in groups of at least six. A very active fish, it requires open areas in which to swim and is best kept in aquariums 90cm (35in) or larger. Aggression is generally limited to conspecifics in appropriate setups, but they may harass other fish in too small a tank, or without enough other tetras.
Spawning may occur in home setups, with the eggs being scattered over fine leafed plants. Soft, acidic water is required for hatching to occur. Males may be differentiated from females by their slimmer, more streamlined form and more intense colouration.
↑ Thomaz, A.T., Arcila, D., Ortí, G. & Malabarba, L.R. (2015): Molecular phylogeny of the subfamily Stevardiinae Gill, 1858 (Characiformes: Characidae): classification and the evolution of reproductive traits. BMC Evolutionary Biology, (2015) 15: 146.
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