Aqua One Flexible Airstone 90cm 3ft Aqua One 90cm Flexible Airstone* All life forms require a certain amount of oxygen to live and aquatic species are no exception. Aerated water plays a big part in ensuring the health of your fish and aids their ability to withstand stress and disease. Aeration also helps maintain water quality and improve the performance of your filtration system. The Aqua One Flexible Air Stone helps you to create a stunning curtain of silvery bubbles in your aquarium. The Aqua One Air curtain is flexible, which allows you to bend around rocks and ornaments. Looks great and oxygenates your water to keep your aquarium healthy. Aqua One's Flexible Airstones is available in a variety of lengths. They turn the air from an Aqua One Air Pump into fine air bubbles to assist in maximising the oxygen level in your aquarium by moving water to the surface. *Please note Airpump is NOT included.