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Do you have a freshwater test kit?
Usually we need to know ammonia/nitrite/nitrate/pH/temperature values before we can help. Fish species, tank size, filtration and any other info you can provide may help. Any signs of disease?
Need more info. Test levels, what kinda of fish+ how many, water changing schedule, what size tank, Filtering system, temp? Is the tank cycled? And have you added anything new to the tank?