Hugo Kamishi Coral Sand 10mm is suitable for use in freshwater and marine type set ups. Coral sand is generally light-coloured sand (or gravel) which is mostly composed of calcareous fragments of biogenic origin. This Hugo Kamishi Coral Sand contains a broad spectrum of natural marine bacteria found in the ocean. Therefore making it  a great way to recreate a seabed as this also provides a good rooting medium for live plants. Not only will your fish benefit from the coral sand, it also will enhance the complete look of your aquarium.