Volcanic rocks are the perfect addition to the bottom of your fish tank or aquarium, helping you create a beautiful underwater world!

• Natural material: Volcanic rocks are 100% natural and safe, they do not affect the pH or chemical composition of the water, and are suitable for both freshwater and saltwater environments.
• Decoration: With a beautiful natural shape, volcanic rocks provide a colorful and detailed element to your tank or aquarium.
• Biological filter: These volcanic rocks serve as excellent natural biological filters, improving water quality, boosting oxygen levels, and reducing nitrates.
• Various uses: Volcanic rocks are suitable for rock gardens, planters, and decorative stone arrangements.
• Color: Black
• Material: Volcanic rocks
• Size: 1-2 cm
• Weight: 10 kg