Attention! Check Dimensions of the decoration before purchasing. Just rinse the product within a tap water and its ready to use. Plecoceramics Honeycomb Cave decoration is made of clay firing at high temperature. This makes our ornament absolutely safe for people, aquarium fish and pets. The fish house can be used for reduction agression among fish. Fish tank decoration looks very natural inside tank. Just flush the tube in running water before use. Can be used for most of fish and shrimps species. Specifications: Material: Ceramic Dimension: 8.86*4.13*4.13 inch weight: 1.39lb Fish tank size: recommended for 15-50gal tanks Customer service: when you receive your package, if find any damaged or defected item, please feel free to contact us at the first time, we can resend you a new replacement.