vidaXL Volcanic Rocks 10-30 cm Sized Black Lava Stones for Aquariums and Landscaping - Biologically-Formed Natural Rocks for Aquatic and Garden Environments

The volcanic rocks are a perfect addition to the bottom of your fish tank or aquarium, helping you create a beautiful underwater world! Features: Natural material: The volcanic lava rocks are 100% natural and safe which won't affect water's pH or chemistry and are suitable for both fresh and saltwater environments Decoration: With beautiful natural shaping, the lava rocks provide a colourful and detailed focal feature to your fish tank or aquarium Biological filter: These volcanic stones make for grea... - Manufacturers part number: 3217189

• 【Product Details】: Comes in black color, weighs 25 kg, and measures 10-30 cm each, allowing for plenty of configurations
• 【Wide Applications】: Suitable not only for fish tanks and aquariums but also ideal for garden landscapes and planters
• 【Decorative Element】: With unique and natural shaping, these black lava rocks add an aesthetic touch to your aquarium
• 【Natural Material】: Sourced from 100% natural volcanic rocks, safe for both fresh and saltwater environments
• 【Biological Filters】: Improves water quality, boosts oxygen levels, and controls nitrates, offering a healthier habitat for aquatic life