The quality of the aquarium water in your tank is extremely important for the health of your fish and for a successful aquarium. There are several things to consider that will keep your tank in optimum condition and safe for your fish.
Fish need clean water to stay healthy. Biological filters help to take out the toxins that are formed by organic waste in the water from fish waste to decaying food and plant matter. These filters help to purify your water by natural means.
What looks like clear water might be full of chemicals and toxins that could be fatal for your fish. Checking the quality and the chemical make-up of your aquarium is a high priority matter when you start your aquarium hobby.