In children, symptoms may depend on age: In infants younger than 1 month of age, symptoms may include having little or no energy (lethargy), feeding poorly, grunting, or having a fever. In children, symptoms of pneumonia are often the same as in adults. Your doctor will look for signs such as cough and a breathing rate over 60 breaths a minute.
Tap water should sit for at least an hour before adding any fish to the bowl. The water must be room temperature.
Re: Why my goldfish keep swimming at the top of water? 1 week may not be sufficient enough time for a filter to fully cycle. For now, all you can do is to test the water for the usual suspects - nitrite, nitrate and ammonia, along with increasing aeration.