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http://petskeepersguide.com/forums/Thread-New-fish-died-in-a-few-hours#:~:text=Died%20in%20hours%20is%20a%20sign%20of%20shock.,do%20not%20like%20newly%20setup%20fish%20tank%20anyway.
http://petskeepersguide.com/why-did-fish-die/
When fish die that fast (a few hours), it must mean they were in shock. Acclimation is the key. Not just the water temperature they must get used to. You need to slowly replace the water in the plastic bag with the water from the fish tank. It will give them time to adapt. How big is your fish tank again? I did not see a number there.
http://petskeepersguide.com/forums/Thread-New-fish-died-in-a-few-hours
While ammonia and nitrite can kill the fish, they do not kill so fast. Died in hours is a sign of shock. It can be easily avoided with proper acclimation. On the side note, there is no need to take down the fish tank repeatedly. Something in the tank is unlikely the cause, and the fish do not like newly setup fish tank anyway.
https://www.reef2reef.com/threads/fish-dying-within-hours.864844/
What frustrates me the most is getting a fish from an lfs, quarantining it for 30 plus days with meds with no issues and then to have it die within hours. Is it fish quality from the lfs? Maybe. I know it must be assumed that any new fish is diseased. That is the way I approach any new specimen.
https://www.myaquariumclub.com/fish-dying-within-hours-996256.html
One black tetra died within an hour and the other overnight. Returned them to the store, talked to manager and he gave me two more neons. One died with a few hours and the other some time during the night, so less than 18 hours.
http://petfishclub.com/aquarium-fish-died/
Fish died in shock because there is a sudden large change in water temperature, PH, hardness, etc. …
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