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I had neon tetras about two months ago and they lived for under a week. They both died in the exact same place and the exact same position, only two days apart. I had an ornament where they both died mouth down on a rock shaped ornament. What happend?

Need more info. What were your water parameters (pH, ammonia level, nitrite, tank size, # of inhabitants and what they are)?

I have a thirty gallon tank and then I only had two guppies and a female betta with them. My nitrite level was pretty high, though

The Nitrite was the culprit. I would think by now, that the tank is cycled. You should have your LFS test your water or do it youself if you have the test kits. Another thing, neon tetras are schooling fish and like to live in groups of 6 or more. The more the better with this fish. What is your stock now? Are you still interested in keeping them?

In addition to all of the above,

Neon are not the hardiest of tetras, they should be very
slowly acclimated to tank condition before being added.
infact It would be better if you had a quarantine tank to
use, this way you lower the possibility of disease. The
hardiness of tetras seems to vary from area to area. Some
have proven to be quite resilient while others, died
shortly even after careful acclimations.

An example being rummynose in my area, even with 2 hours
drip acclimatation i lost nearly half of them. I don't
say this to scare you away from them, but it is a
possibility as to why they perished, though I am inclined
to agree with CLF that the nitrite was a key factor in
their demise.

As to their location when you find them, it more than
likely that the area has alow flow and the fish is carried
there by the current and the lack of current in the area,
means the fish won't move from the area.

HTH,
Megil.

befor u put your fish in the tank put the bag u bought it in the tank for 30 minnutes for it to be the same tempature as the water in the aquarium then put little by little of the aquarium water in the bag every 10 minnutes or so, to make the fish more hardy for that type of water and your fish wont get a desiese