Dimart JFS1002 Ceramics Tank for Fishes Shrimps Breeding Hiding Spots Cave Ornament Aquarium Decorations - Gray High quality, made of ceramics, very durable and practical. Create a natural ecological environment, very comfortable for fishes and shrimps. Water purification function, adsorb microorganisms. No pollution, non-toxic, no harm to fishes and shrimps. Ceramic stones provide a lightweight alternative to real stone in your aquarium. The hollow caves provides shelter, hiding spots, and spawning sites for fishes and shrimps.