Gregory Ho wrote:
You never mentioned the temperature of your aquarium. I have found
that Neon Tetras do not do well over 76 F. I bought ten of them for 99
cents and they all lasted but three days at 80 F. I did some research
and learned the temperature was too high. I never bought more because
I prefer a warmer temperature aquarium for my plants.

I beg to differ as I have a school in a tank with discus and the water
temp is always in the higher range, from 29-31 degrees celcius, and
they've survived more than six months now, withstanding the temperature
change from the LFS to my tanks. I've read about neon tetra disease
which causes kidney stones cause by calcifying deposits in that organ,
due to the very hard water.