vidaXL Black Volcanic Lava Rocks for Fish Tanks and Aquariums - Natural Biological Filters and Landscaping Material - 10 kg, 1-2 cm

【Aquarium Decoration】: Add a colourful and detailed focal feature to your fish tank or aquarium with these natural-shaped black lava rocks 【Product Specifications】: Each rock measures 1-2 cm in size and the total package weight is 10 kg, enhancing the aesthetics of your environment 【Effective Biological Filter】: These volcanic lava stones serve as natural biological filters, enhancing water quality, oxygen levels and nitrate control 【All-Purpose Landscaping】: Apart from aquariums, these black volcanic rocks are also perfect for garden landscapes, planter beds and various rock applications 【Natural Material】: The vidaXL Volcanic Rocks are made from 100% natural and eco-safe materials, ensuring they don't disturb the water's pH or chemistry