Good info,now i know about Neon Tetra Fish.

The first key indicator of Neon Tetra Disease in your aquarium is restlessness of infected fish.
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In 1996, I tried I think four neon tetras in my 10 gallon tank which had a paradise fish and a fewother fish in it at the time. The neons all died within a week (no other fish died). I have no ideawhy. Never before have fish died so quickly and with no apparent reason. My water is very soft. Perhaps one of the other fish stressed them or they came in with a disease that killed them andnot the other fish in the tank.
Neon Tetras are peaceful tropical fish and best kept in schools of 6 or more.
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The Neon Tetra is a well-known breed of tropical fish originating in the South American waters. They are popular for their opalescent hues, and are also extremely famous among the fish aquarium hobbyists around the world. They fall under the small group of fishes (but not to be confused with black neon tetra, gold neon tetra, yellow neon tetra, diamond head neon tetra or cardinal tetra), and make great pets for beginners and new enthusiasts, adding color and activity to the aquarium. Neon Tetra Disease is highly contagious due to the way it is communicated between fish species.
Photo provided by FlickrNeon tetras are an incredibly beautiful species of tropical freshwater aquarium fish.
Photo provided by Flickrneon fresh water fish pics | Gold Neon Tetra, (Paracheirodon innesi) Species Profile, Gold Neon ...
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The Neon Tetra is an extremely popular aquarium fish. It is sturdy and inexpensive and is often one of the first fish species purchased by beginner aquarists. A shoal of brightly decorated Neon Tetras will add colour as well as activity to the aquarium. Since the Neon Tetras stay quite small and have a peaceful temperament, they are often found in small community aquariums. The Neon tetra is an extremely popular aquarium fish, especially among beginner aquarists. Over 1.5 million Neon tetras are imported to the United States alone – each month! It can be tricky to breed in captivity for hobby aquarists, but professional breeders that produce immense quantities of Neon tetra exist in several countries world wide. If you purchase Neon tetras in the United States, the chance is high that they hail from Thailand, Singapore or Hong Kong. Wild caught Neon tetras from Brazil, Colombia and Peru are however also still available in the trade. The Neon tetras belongs to the genus Paracheirodon in the family Characidae. This makes it closely related to other popular aquarium fishes like the Cardinal tetra (Paracheirodon axelrodi) and the Green Neon tetra (Paracheirodon simulans). The less commonly kept Black Neon tetra (Hyphessobrycon herbertaxelrodi)is however a more distant relative since it belongs to another genus within the family Characidae; the genus Hyphessobrycon.
All members of the genus Paracheirodon are native to the Neotropic ecozone in northern South America and their bodies are decorated with a characteristic sparkling blue lateral line. They are often kept together in planted community aquariums with soft, acidic waters and tropical water temperatures. The Neon Tetra fish is one of the most attractive of all the readily available tropical fishes. The neon tetra has been getting a bad reputation in recent years for the difficulty in keeping them alive in the home aquarium. This bad reputation could be attributed to the increasing public demand and the methods by which breeders are meeting those demands by the inbreeding of this once hardy tropical fish.The Neon Tetra is a pelagic freshwater fish native to tropical parts of northern South America. The Neon tetra originates from westerns Brazil, south-eastern Colombia and eastern Peru and wild Neon Tetras can be found in the headwaters of the River Amazon, Tiger, Napo and Yarapa. It is present in both blackwater and clearwater stream tributaries. You can however not find Neon tetras in the whitewater rivers that run from the Andes. The Neon Tetras have bright colours and an iridescent stripe in order to be visible in dark blackwaters. The Neon Tetra is often mixed up with the Cardinal Tetra, since they both feature striking red and blue stripes. The Cardinal Tetra is even sometimes referred to as “Red Neon Tetra” in everyday language, even though it is in fact a separate species and not a colour variation of the Neon Tetra. Distinguishing these two species from each other is however not difficult at all if you know what to look for. Under the sparkling blue stripe, you will see a red lateral stripe in both species. If this red strip ends roughly halfway from the nose of the fish, you are looking at a Neon Tetra. If the striping instead continuous much longer, you are looking at a Cardinal Tetra. The name Cardinal Tetra is derived from the long, red robes worn by cardinals and these robes do not end half-way.