HomeWhy is it necessary to maintain a healthy aquarium? What is a chemical environment?Why is it necessary to remove waste products from the aquarium?How do filters keep the aquarium clean?How does biological filtration work? What is substrate?

What is substrate?
      The rock and gravel, present at the bottom of an aquarium, together are called the substrate. Colonies of bacteria that are involved in the nitrogen cycle can grow on the substrate. The more bacteria there are in the tank, the better the chances for the survival and well being of the fish.

How does the nitrogen cycle work?