Tutti Frutti Gravel Pisces Natural Products is proud to offer you a new line of unique natural colour aquarium gravel. For the first time in Australia, real gravel that is naturally coloured and will not effect the pH of the aquarium. These rare gravels are guaranteed to make any tank look spectacular. All gravel is specially graded to 3mm–5mm which is the optimum size for aquarium use. Pisces Natural Products aquarium gravel is real, contains no artificial colour and is safe for use in any tank.