vidaXL Volcanic Rocks 10 kg Black 10-30 cm, Black

【Decorative Element】: Incredibly detailed and vibrant, these lava rocks add a stunning colour and textural contrast to your fish tank 【Biological Filter Function】: Acts as an excellent biological filter, improving water quality, boosting oxygen levels and controlling nitrates for a healthier aquatic habitat 【Versatile Use】: Not only for underwater habitats, these black volcanic rocks are also perfect for use in garden landscapes, planter beds and other landscaping rock applications 【Product Specifications】: Weighing 10 kg with sizes ranging from 10 to 30 cm, these black volcanic rocks from the brand vidaXL are sure to make a striking impression 【Natural Material】: Beautiful black volcanic rocks composed of 100% natural and environment-friendly components, suitable for both saltwater and fresh water aquarium environments