1. For shrimps, small fish, marine fish for breeding, breeding and shelter. 2. Design a natural living environment for the shrimp to shelter or to generate , you could use some small thread to bundle the moss on the product constitute a nature living environment 3. Made of Ceramic, non toxic to the fish and shrimp and other creatures under the water. 4. Won’t change water hardness and PH 5.Extremely porous ceramic material provides living space for good bacteria to remove ammonia and nitrites , can process water filtration in your aquarium. 6.Practical and attractive decor. Suitable for freshwater and marine aquarium.