Related Species and Other "neon Tetras"
The green neon tetra (P. simulans) and black neon tetra (Hyphessobrycon herbertaxelrodi) are distinct species—the latter belongs to an altogether different genus—and not color varieties. The cardinal tetra (P. axelrodi)—also sometimes called the red neon—is a very similar species, and is often confused with the true neon tetra. In a domestic aquarium, the two species will school together, especially if numbers of one of the species are insufficient to form a school. The neon tetra will also school with P. simulans if there are only a few of each. The cardinal tetra's larger size and greater extent of red coloring distinguishes it from the neon tetra. The term Hyphessobrycon innesi is an obsolete synonym for P. innesi, the neon tetra itself.
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