This is a test of commonsense. Complete the next sentence:

How to keep aquarium water clear
Leave the cloudy water.
Many times cloudy water will disappear on its own while the water environment adjusts. Often, cloudy water is a result of mixture of microscopic organisms, such as bacteria, protozoa, and micrometazoa.
These organisms come from your fish, the food, and waste. Usually, the tank will balanced out and clear up within around a week.