Lava Rock is full of nook and crannies which make it ideal for planting or just to keep your fish interested in their enviroment. Another natural product that has unique colouring making it a excellent focal point in the aqaurium. Suitable for both freshwater and marine setups Please rinse gently with cold water before use to remove any dust or particles. No need for chemical cleaning or use of abrasive sponges to clean. Aquarium enviroment should always be stabilised before introducing fish.