Aquarium accessories are essential items that enhance the functionality and aesthetics of fish tanks. Common accessories include filters, heaters, and lighting systems, which help maintain a healthy environment for aquatic life. Decorative elements like rocks, plants, and ornaments also contribute to the visual appeal of the aquarium while providing hiding spots for fish. In addition to these basics, other accessories such as air pumps and substrate materials play a crucial role in water quality and fish health. Regular maintenance tools, like algae scrapers and water test kits, ensure that the aquarium remains clean and safe for its inhabitants, promoting a thriving aquatic ecosystem.