Common name: blue danio
Scientific name: Danio kerri
Synonyms: Brachydanio kerri
Size: 5 cm / 2 inches
pH:.5-7.0
Temperature: 22 - 25 °C (73 - 77 °F )
Hardness: 7 - 12 dH
Lifespan: 6 years (usually only 2-4)

The Blue danio is hardy little aquarium fish highly suitable for beginners. It is a friendly species that won’t hurt or disturb anything that is too large to be eaten. They are a shoaling fish and should never be kept in groups of less than 6-8 specimens. An even larger shoal is better. This species is relatively common in the aquarium trade and you should be able to find it if you want it.  The Blue danio was very popular in the old days due to its hardiness and due to the fact that it accepts colder water. This species still deserves our love and attention.