10-24-2008, 02:15 PM
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Could you give us some more information about the situation? How big is the tank? Is it heated and filtered? Did you cycle it properly before adding the fish? How often are you changing the water? Do you know the values of your water parameters (temperature, pH, ammonia, nitrite, nitrate)? If you don't, these are really important numbers to know, especially in a new tank or one with problems. You should get yourself an aquarium thermometer if you don't already have one, as well as a good liquid test kit like the API Freshwater Master Test Kit. It costs about $15 at online aquarium supply stores like Aquariumguys, Drs. Foster and Smith and Big Al's, but about twice that much in retail stores. However, it's an essential tool for any fishkeeper.
Most of the time, sickness in fish is a result of poor water quality so improving the water quality will definitely be beneficial and is necessary before you try using any medication. If you don't know your water parameters, I strongly urge you to get that test kit as soon as possible. In the meantime, you can take a sample of your aquarium water to a fish store and have them test it for you. Many of them will do this for free. Make sure they give you exact numbers for pH, ammonia, nitrite and nitrate. The white water and clouds are usually an indicator of a bacterial bloom, which often happens as a tank is cycling, which means your water quality is likely not so good. Before you do anything else, I would do a 50% water change with water that is the same temperature as the water in the tank and that has been treated with a water conditioner.