The aquarium should therefore have a correspondingly large free swimming area. Tetras are social animals and show swarming behavior or they swim in loose formation, if a sufficient group size is met. Most of the known tetra species remain rather small, so that they have become very attractive as a social animals for the aquarium. Such is the name given to the small fin between the tail and dorsal fin of the fish. However, almost all tetras have the so-called adipose fin. In this respect, it is difficult to define characteristics typical of tetras. In terms of both coloration and body shape (narrow or high-backed), tetras are impressive because of their enormous diversity. A smaller part of the species, however, is native to Africa - such as the popular congo tetra. There, among other things, both black- and clearwater biotopes are populated. The largest amount of tetras comes from South America, especially from the upper Amazon region. They are easy to care for, and socialization with other fish species is possible. Many animals of this family are peaceful schooling-fish, therefore, tetras should be kept in larger groups. hatchet belly fish, penguin fish and even piranhas. Most imported ornamental fish are tetras, such as the classic neon fish. Even if only a very small part of the tetra family is relevant for the aquarium, the natural variety with over 1900 known species is very high.
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