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Arguably the most popular of the small tetras, the cardinal tetra is similar in appearance to a longtime aquarium favorite, the neon tetra—you can tell them apart by one particular detail: a slight difference in their red stripe. Cardinal tetras are active schooling fish, and they live peacefully in a community aquarium.
Although they are difficult to breed in captivity, tetras remain a very popular aquarium fish. Here’s everything you need to know to keep cardinal tetras happy and healthy in your tank.
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