Specially selected decorative substrate to recreate the bottom of aquariums Thanks to this natural substrate, you can set up your aquariums safely. Non-toxic, it can release small amounts of carbonates USE: For fresh and sea water. Arrange an indicative layer of 4 cm in the front and 7 cm in the back, creating a difference in level that gives depth to the view of the tank GRAIN SIZE: 6-10 mm SIZE: 5 Kg AVAILABLE FORMATS: 5 Kg bag