A creature made of transparent plastic is a hollow sphere. It has a large surface area and can bind a large number of nitrifying bacteria. Can plant moss and other aquatic plant bundles, while placing filter materials to purify water quality . File structure, easy to install and disassemble, very suitable for DIY. This product does not contain aquatic plants, you need to add aquatic plants for cultivation Name: Meiyi ETB submersible foam ball two in one foam ball Specifications: Diameter 5CM Height 3.6CM Function: It can plant moss and other aquatic plants grouped together to make moss balls, etc. At the same time, filter material can be placed to purify water. Can also be used as a pepper ficus stand Features: 1 . Threaded structure is convenient for installation and disassembly without tedious DIY process 2. Transparent material is crystal clear 3. Aquatic plants can be planted and filter materials can be used to purify the water. Quantity delivered: 2 pieces