If you're dealing with a new aquarium, cloudy water is best cleared by simply giving the aquarium time to adjust. It is a sign that something is slightly(and sometimes, majorly) out of balance in the aquarium. This would be understandable in a new aquarium set-up. Generally, attempting to fix cloudy water will cause more problems than it will solve. For aquariums that have been in operation for a several weeks or longer, cloudy water is an indication of imbalance of the water chemistry and should not be ignored. Taking a sample of your aquarium water into your Big Al's location for analysis or purchasing an aquarium test kit to ensure all perimeters are within a safe range is highly recommended. In all cases a small (20%) partial water change and reduction of the amount of food being offered should help improve water clarity.