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Cardinal Tetra  (Chinese name: 霓虹灯鱼)

 
Cardinal Tetra
Image courtesy of Wikipedia
Growing to about 3 cm (1.25 in) total length, the cardinal tetra (Paracheirodon axelrodi) has a striking iridescent blue line laterally bisecting the fish, with the body below this line being bright red in color. The cardinal tetra's appearance is similar to that of the closely related neon tetra, with which it is often confused; the neon's red coloration extends only about halfway to the nose, however.

The cardinal tetra is a very popular aquarium fish but is less widespread than the neon tetra as it is difficult to breed in captivity; most specimens sold in the aquarium trade have been caught in the wild and imported. This doesn't seem to pose an environmental concern (the fish is very common in the wild.)

Perhaps due to their wild-caught origins, cardinal tetras tend to be somewhat delicate in captivity. In the wild, these fish inhabit extremely soft, acidic waters, but seem to be tolerant of harder, more alkaline water conditions; a greater concern is probably polluted tank water (including high nitrate levels.) They prefer warmer water temperatures (in the upper 70s °F or warmer), and will readily accept most forms of dry food.

 
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