Cycling a saltwater aquarium is a vital step in establishing a healthy marine ecosystem. By understanding the nitrogen cycle and using live rock and live sand, you create a stable environment for marine life. The process involves converting toxic ammonia into less harmful nitrate through beneficial bacteria. Patience is key, as cycling can take weeks. Regular monitoring of water parameters, performing water changes, and introducing fish gradually ensures success. With the right approach, your saltwater tank will thrive, providing a vibrant underwater world to enjoy.