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The Cardinal Tetra
Unlike neons, cardinals are wild caught and are not aquacultured as are the neons. This explains why they boast a slightly heftier price tag. Cardinals should be kept in pairs or preferably a school. They can live at higher temperature, and this is why they are often seen with discus. Many people believe the cardinals are prettier than the neons, but it all really comes down to personal taste. A school of cardinals infected my planted ten gallon tank with disease. Of the ten I ultimately bought, four survived. They took with them a number of other fish, including a beautiful golden male betta, a kuhli loach, and a couple neons. Although they are prone to diseases like intestinal parasites because they are wild caught, they do not contract the neon tetra disease.
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Cardinal
tetras grow a little longer than their neon counterparts, and their
red bottom stripe continues over their abdomen to their mouth.