Material: Resin feature: 1. Multifunctional: decoration, breeder, shelter, filter. 2. It is necessary to plant aquatic plants in pots, which are easy to maintain and remove algae. 3. Design a natural habitat for fish and shrimp to inhabit or produce. 4. Especially made of ceramic materials, which can be used for the filtering function of the aquarium. 5. They are completely safe for fish or plants.