Gravels are one of the most important part of aquarium because they keep water fresh and healthy long and long time by absorbing all the wast they work as a good biological filter because they work as a great part in decoration these provide a very healthy environment to plant and fishes shining glow white color stones (gravel form) is very important for healthy aquarium.Product Specification:Gravel are tumbled gravels made of natural stone.They add extra beauty and elegance to your house and garden.They can be used as landscaping and garden stone as well as for home decor.They can also be used in aquariums.Can also be used for decoration of Lawn, Garden or can be used in other decorations as well.