vidaXL Black Volcanic Rocks, Natural Aquascape and Landscape Decor, Biological Filtration Rocks, Aquarium Safe - 1-2cm, 10kg Pack

Biological Filtration: Enhances water quality and oxygen levels while controlling nitrates, making these rocks an effective natural biological filter for aquariums Versatile Decoration: Add beauty and detail to aquariums and fish tanks with these black volcanic rocks featuring natural shaping Landscaping Applications: Not just for aquariums, these rocks can also be used for garden landscapes and planter beds offering wide applications Physical Details: Each black volcanic rock is 1-2 cm in size, and the total packaged weight is 10 kg Natural Material: Composed of 100% natural volcanic rocks suitable for both fresh and saltwater environments without altering aquarium pH or chemistry