AQUANATURE SIPHON VACCUM GRAVEL CLEANERS is Proper maintenance essential for effective aquarium management. Regular water changes and the removal of debris from the gravel contribute to sustaining a natural equilibrium within the aquarium ecosystem. AquaNature Siphon Vacuum Gravel Cleaners simplify this task, reducing the time required. A straightforward up-and-down motion with the intake tube quickly primes the siphon, initiating water flow. As water flows, debris is carried away and disposed of, while gravel settles at the bottom of the aquarium. Remember to use AquaNature Water Conditioner when introducing fresh water into the aquarium. There are five different sizes of siphon gravel vacuums available to suit various aquarium sizes.