While commercially bred neon tetras have adapted properly to a wide variety of water conditions, within the wild they inhabit very soft, acidic waters that are typically cooler than the 25 °C (77 °F) at which maximum tropical aquaria are maintained. They can have a lifespan of up to ten years, or normally about five in an aquarium.
Neon tetras reach 3.five cm in length, and are considered clean to keep in a network aquarium of at the least 50 cm (20 in) long, with a pH of 6.0 to 6.five and a KH of 1.0 to 2.0. However, they will die if traumatized with the aid of dramatic adjustments to their environments. They tend to be timid and, due to their small size, should not be kept with large or competitive fish which may bully or in reality eat them. Fish that mix nicely in an aquarium are guppies, dwarf cichlids, smaller danionins and barbs, other styles of tetras, inclusive of the rummy-nose tetra, cardinal tetra, and glowlight tetra, and other community fish that stay well in a perfect tetra water condition. Mid-stage feeders, they are best saved in faculties of six or extra, for the shoaling impact when they move around the tank. They shoal naturally in the wild and are thus more brightly colored and more lively when stored as a shoal in preference to singly. The color and the iridescent stripe of this fish can also become dim at night, and might be truly invisible after a period of darkness. The color can also fade for the duration of a length of stress, which includes human intervention into the tank. Neons are nice saved in a densely planted tank with subdued mild and a perfect temperature of 21–27 °C (70–81 °F) to resemble their native Amazon environments.