Aquaforest AF Bio Sand – Premium Natural Aquarium Substrate Aquaforest AF Bio Sand is a natural white substrate sourced from the highest quality deposits, offering purity and optimal calcium carbonate content to stabilise water chemistry in your aquarium. Designed with advanced technology, this substrate accelerates the nitrogen cycle, enabling faster aquarium maturation and quicker introduction of livestock in newly established tanks. Each package includes two bottles containing isolated strains of nitrifying bacteria and a nourishing solution, promoting rapid bacterial growth and efficient chemical breakdown. Key Features: Natural white sand.