Updated On October 19th, 2017
Pet's info: Fish | Unknown - Fish
Answered By Angel Alvarado, LVT 44
Licensed Veterinary Technician
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This cloudiness is likely due to a bacterial bloom. This can happen if a tank is not properly cycled. Changing the water may make the condition worse. The fish could have been killed by elevated ammonia or nitrite levels. Use a home test kit or submit a water sample for testing. Most pet or fish stores will do this for free or for a nominal fee. If it is a new tank, allow it to properly cycle. This can take 4 or more weeks for the beneficial bacteria to populate the tank and filter. Once ammonia and nitrites are at 0.25 ppm (parts per million) or less and nitrates are at 40ppm or less, you can add fish. Goldfish are cold water fish and do best between 65 F and 72 F. They also need a larger aquarium than most fish. 20 gallons per fish plus an additional 10 gallons for each additional fish is recommended. They produce a larger than normal bio load which can quickly foul water, so a filter rated for at least twice the tank volume is strongly recommended as well.
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