Fish dying

[Ashley.m.89]

so I check all my levels daily and they are all fine. The salt level is perfect, and so is the temperature. I came home from work today, and all my fish were dead.

 

[Mike in CT]

We need more info. How long has your tank been running, when is the last time you added fish, what are your specific parameters... Etc... The more info the better.
Sorry about your fish

 

[Tahoe61]

Fish types
How large of a system
How many fish
Type of filtration
Ammonia and nitrite, nitrate levels


As already posted we need some basic information to trouble shoot the issue. The cause of an over night death of all fish is usually lack of available oxygen for one reason or another, or new tank syndrome.