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

• Natural material: Volcanic stones are 100% natural and safe and do not affect the pH or chemical composition of the water. They are suitable for both freshwater and saltwater environments.
• Decorative: With a beautiful natural shape, volcanic stones add a colorful and detailed element to your tank or aquarium.
• Biological filter: These volcanic stones serve as excellent natural biological filters, improving water quality, increasing oxygen levels, and reducing nitrate levels for a cleaner and healthier environment.
• Versatile uses: Volcanic stones are also suitable for rock gardens, planters, and wherever decorative rocks are needed.
• Color: Black
• Material: Volcanic stones
• Dimensions: 3-5 cm
• Weight: 10 kg