They are schooling fish that are actually quite active, they may spend more of their time during the day darting around the tank. When they are stressed however they may show some aggression by nipping at others’ fins. Neon tetras are nonaggressive fish and do well with many other peaceful fish that are similar in size. They have thin and narrow bodies that are shaped like a torpedo. In the wild however they have been known to grow to about 2 to 2.5 inches in length.
An adult neon tetra can only grow to about 1.5 inches in length in captivity. Neon tetras are very small fish, in fact, they are one of the smallest species of aquarium fish. Some of the different variants are: Longfin neon tetras, black neon tetras, diamond head neon tetras and albino tetras. There are different varieties of neon tetra due to different breeding in captivity. The neon tetras also have a white belly, aside from the colors on their body they are translucent which allows them to blend in more with their surroundings. This stripe is where people will mistake them for cardinal tetras as they have a similar red stripe on their bodies. Under that blue stripe is a red stripe that extends on the bottom half of the body onto the tail.
It is believed that this stripe can actually be used to improve visibility. They have a blue stripe from the tip of their heads to the adipose fin, this is iridescent and reflects light.
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