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.
Some folk don't even seem to wait that long. I always check the temperature though of any water to make sure its as close to the tank temp as possible as i can. I'm sure many folk on here probably do let their water sit for 24 hours, but i think much of it comes from old habits really.