Green neon tetra
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The green neon tetra (Paracheirodon simulans) is a freshwater fish of the characin family (family Characidae) of order Characiformes. It is native to the upper Orinoco and Negro Rivers in South America.
This fish is similar in appearance to the closely related and better-known neon tetra, but it is slightly smaller and its red patch is less pronounced, while the blue-green areas of the upper body are more brilliant. Also, its body is slimmer than that of the neon tetra. It grows to a maximum overall length of about 2.5 cm (1 in).
This fish loses its brilliant blue and red colors when lights are switched off in the dark, but regains it when lights are switched on again.
Water conditions 
The wild green neon tetra comes from extremely soft, acidic water at temperatures around 24 to 29°C (75-81°F). These are the ideal conditions for this fish. It will adjust to neutral water with some hardness and temperatures near the bottom of the range, and is fine in a community tank with small peaceful fish.
Filters with excessively strong water intake are dangerous because this little fish is prone to get sucked in by strong currents, perhaps even more so than the neon tetra.
The green neon tetra, an omnivore, will eat normal fish foods of a suitable size. Small live food, such as mosquito larvae and Daphnia, frozen blood worms and frozen brine shrimp are good.
For breeding, these tetras need water similar to the waters in which they live in the wild; extremely soft water with a pH of about 6 and a temperature of around 77°F (25°C). Ideally, the water should be highly stained by the tannins from peat, in subdued light, shaded by plants. It spawns in a school, although in the actual act of spawning, one female may be closely associated with one or more males.
About 130 eggs can be laid by each female. The parents should be removed after spawning. The eggs should hatch in 24 hours. The eggs are light sensitive so avoid light. The babies are very small, so feeding infusoria (protozoa) is necessary early on. As they grow, this can increasingly be supplemented with fine commercial fry foods. Adults can breed again after a few weeks.