Fish Aquarium

An aquarium must be maintained regularly to ensure that the fish are kept healthy. Daily maintenance consists of checking the fish for signs of stress and disease, on a daily basis. Also, aquarists must make sure that the water has a good quality and it is not cloudy or foamy and the temperature of the water is appropriate for the particular species of fish that live in the aquarium.
Typical weekly maintenance includes changing around 20% of the water while cleaning the gravel, or other substrate if the aquarium has one. A good habit is to replace the water extracted while "vacuuming" the gravel as this will eliminate uneaten foods and other residues that settle on the substrate. Tap water is not considered to be safe for fish to live in because it contains chemicals that harm the fish, so any tap water used must be treated with a suitable water conditioner, such as a product which removes chlorine and chloramine, and neutralises any heavy metals present. The water parameters must be checked both in the tank and in the replacing water, to make sure they are suitable for the species of fish kept.