Natural rocks "The reef Rock" (20kg) - Size M Contains a mix of medium size rock ranging from 20 cm (8 inch) to 24 cm (10 inch) size. Each rock weight 1,5 kg to 2,5 Kg. Collected in the Oceania tropical nature. 100% natural rock, 0% artificial rock. THE REEF ROCK® is a ready-to-use natural rock collected from a sustainable source causing a low...