Cardinal tetra, Paracheirodon axelrodi. These were discovered by Dr. Axelrod way back when are in the characin family. They are from the Rio Negro in Brazil where the waters are nearly black (hence the name) from decomposing organic matter as the rains flood the Amazon jungle. They are annuals in the wild but live up to 7 years in captivity. They are easily distinguished by the more common and somewhat hardier Neon tetra by the length of the red stripe which extends the full length of the body in Cardinals but only about half way in Neons.
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