he Cardinal Tetra is the most popular aquarium fish (sales wise) of all time and is very charming in appearance and behavior. A serene yet gregarious fish, it is known as the Neon Tetra's "big brother". The two are very similar however the Cardinal Tetra is slightly more delicate. In addition, the red coloration of the Cardinal Tetra extends through its whole body length.

The Cardinal Tetra will only be comfortable in a school. Buy the best stock available to you, preferably from a local breeder as opposed to a mass produced type. Also choose its tank mates well, as it is the natural prey of many fish, even many of the other tetras. With optimal water conditions and a well thought out tank, the colors will become even more radiant. Keep its water soft and acid. Plant the tank heavily, providing some hiding places and a lot of swimming space. Dark substrate and bogwood will make this fish's coloring even brighter. They also do not like harsh light, nor will it help its coloration.