Bad luck with neon tetras

[sunrise001]

when i first started my first tank i got several neon tetras and a couple of young guppys from the petshop the neon tetras died over noight along with the guppys, a few weeks later i brought more neon tetras to keep the neon tetra who didnt die company all of them died again overnight ph and amonia levels were normal so i was left with 2 remaining neon tetras a week later they died, both of them to. recently a friend of mine started a tank i gave them some of my guppy fry that were a month old (i got their parents from a breeder), and themn she brought some neon tetras all of a sudden the tank water and the guppies became sick same with the neon tetras i fixed the problem butmost of the neon teras died and the guppys any ideas on what the problem is? they were perfectly fine in the petshop :bounce:

[Adrienne]

Okay - the two problems may not even be related.

One - Imported fish can carry disease which they have become immune to but when mixed with other fish who have not been exposed to the disease, some of these fish will die. Did your fish died immediately i.e. the first night you put them into your tank or days or weeks afterwards?

Two - How long has your friends tank been running and how long had the fish been in the tank before they died. How many fish died and how many are still alive. What type of fish died and what is still alive.

I am not quite sure what you mean by ...all of a sudden the tank water and the guppies became sick ... do you mean that there was something wrong with the tank water.

Honestly, and I do not want to appear rude, it would really help if you wrote sentences using better grammar. I both work in a school and have three teenagers but I am struggling to make sense of what you are saying.

[Nymox]

How long had the tanks been running for before fish were added? Were you feeding the tank while it was cycling?

My best bet is that the sudden increase in bioload and the filter couldnt manage. Make sure to add fish slowly to a new tank, and while it cycling fishless, drop some food in to give the bacteria something to feed off. That way by the time you go to add fish there is a good colony of bateria in the filter media.

Adodge already answered this more or less but Id typed it out already hehe

[Jennifer]

Those are some very sudden deaths. I would be worried about toxicities, for example chlorine. Have you used a dechlorinator on your water? After 24 hours or so it could also be ammonia toxicity if the tank has not been cycled yet or the bioload was dramatically increased.

[sunrise001]

the tank water in both tanks were fine in my tank they died over night in my friend tank they died in half a day the guppie i had given her were fine until she put the neon tetras in

[dyinggoldfish]

How many fish did you add at the same time? If it is a new tank that sudden adding off fish can cause ammonia spikes which could potentially kill all your fish? How many litres is your tank? Did you adjust the tetra into it correctly? This is done by putting a cup of your tank water in the bag before releasing them.

The other possible thing maybe would be the temperature or acidity of the water. However you are adament that you did a water test.

Try doing a water change (25%) taking it from the gravel set it up again, do a water test and then go back to getting more fish.