Yes, neon tetras die easily. Although neon tetras have a lifespan of up to 5–10 years, they can die easily. They can die of stress when you keep less than six of them in your aquarium, and they will die if you don’t take proper care of them.
In addition, neon tetras are very sensitive to their environment. To prevent them from dying, you want to make sure to keep no less than six neon tetras in your tank, that you have the right tank size for them, and that you are consistent in maintaining your aquarium. Also, do not overcrowd your fish tank.