Plants keep the ecological balance of an aquarium by supplying?

Plants keep the ecological balance of an aquarium by supplying oxygen and absorbing carbon dioxide. Through the process of photosynthesis, plants use sunlight to convert carbon dioxide and water into glucose and oxygen. The oxygen is released into the water, and the carbon dioxide is used to build new plant tissue. This process helps to maintain the correct levels of these gases in the water, which is essential for the survival of fish and other aquatic organisms. In addition, plants also help to remove toxins from the water, provide food and shelter for fish, and reduce algae growth.