Large solid marble pebbles for decoration or to cover the ceramic media without obstructing the flow of water into the filterr clean flowing well lit water with fish is the ultimate way of transforming bad energy and feng shui pebbles are designed to decorate your aquarium as well as promote the flow of positive energyr available in four colours selected for their different feng shui properties the black pebbles are used to banish negative energyr once in water the colour of the pebbles de