Real plants do wonders for aquariums, providing fish with oxygen and even food. They keep the water chemistry more balanced, and provide scenery for you and hiding places for fish and other tank inhabitants. They’re easy to care for, too. Aquarium plants are part of our biological filtration. They do this by helping to remove harmful ammonia (which fish naturally excrete into the water). Many aquatic plants will help remove ammonia but not nitrites.
Some aquarists use this information in natural aquariums. When planting aquatic plants, we can create new underwater worlds, or try to imitate nature.(source:wikihow.com)