Key Features Adds colour and interest to the tank Easy to place and move when needed Perfect alternative to real plants, reducing the waste produced in the tank Realistic looking Genuine BiOrb The Oase biOrb Pebble Packs are decorative stones that look great in any aquarium setup, and can be mix and matched to create a unique effect. The Pebbles come in 5 styles, each with their own Feng Shui Properties: Red- For Power, Glory and Happiness White - For Spiritual and moral purity Green & Moss - Promotes hope, longevity and vitality Black - to banish negative energy. The Oase biOrb Moss Pebbles are a large and realistic looking moss covered stone. The pebbles can be added to the base of your fish tank to add a decorative touch to the aquarium as well as covering any ceramic media below it. The pebbles are made of marble which is a solid stone and will not cloud the water. Once in the water the colour of the pebbles deepens and shines.. Specifications Black Approx 8 -10 pebbles per pack,