WIO River Kit - Nautilus TanBring the diverse and unique aquatic ecosystems of the Great Rift Lakes of Africa to your aquarium with the Nautilus Tan River Kit. This all in one kit includes a carefully curated mix of warm toned substrate, distinctive perforated stones, and nutrient rich plant substrate perfect for recreating biotopes of African lakes, estuarine, and rocky shoreline environments. At the heart of the Nautilus Tan kit is the Hole Stone a unique sedimentary rock with