The first thing everyone is drawn to is their sensational coloring. It has a turquoise blue line that stretches from its eyes down to its adipose fin (the small rounded fin between the tail and the dorsal fin). In addition to the blue coloration, they also have a red stripe that runs from the middle of their body down to the caudal fin. This bright iridescence helps the fish local each other in murky water conditions.
Their color combination has helped to make them one of the most recognizable fish amongst hobbyists. Interestingly, except for their blue/red coloring they are transparent; in the wild this will help to hide from predators. When they feel really threaten they can even turn off their red/blue iridescent hue to stay safe. Their coloring will also fade when they are sleeping or sick.
Cardinal Tetra vs Neon Tetra
This fish is often confused with the Cardinal Tetra.
If you look closely you will notice that the vibrant red horizontal line of the Neon Tetra only runs from the middle of their body to the tail.
With the Cardinal Tetra their red line runs the entire length of their body.
WHAT TO KNOW ABOUT FEEDING AQUARIUM FISH
In nature, fish eat whenever they are hungry and the food is available. If food sources are plentiful, they will eat several times a day. On the other hand, if food sources are scarce, they might go for days between meals. For this reason, fish are very opportunistic and will eat whenever they have a chance.
Regardless of one or two feedings, the key is to keep each feeding very small. Do Not overfeed your fish. Whenever in doubt, the best practice is to underfeed your fish. There are a lot of health concerns related to overfeeding your fish.