vidaXL Natural Volcanic Rocks Lava Accent Stones Beads - 10 kg, Aquarium & Garden Decoration, Biological Filter for Both Fresh & Saltwater, Size 1-2 cm - Red

【Safe for All Environments】: Suitable for both fresh and saltwater tanks, ensuring a cleaner and healthier habitat for your marine life 【Versatile Decoration】: These red lava stones can enhance the aesthetic of not only aquariums but also garden landscapes and planter beds 【Compact Size】: With a size of 1-2 cm and total weight of 10 kg, these rocks can easily fit into any aquarium layout 【Bio Filter】: Acting as a natural biological filter, these rocks improve water quality and control nitrate levels 【Natural Material】: Made from 100% natural volcanic rocks that won't affect your aquarium's water chemistry