These 3d printed dodecahedron shrimp hides will be great for your shrimp tank! The geometric shapes make them a great decoration, meant to give a space for baby shrimp to hide in to protect themselves from bigger fish. They come in a pack of 5, stack them together for even better results! They can also be used as structure to send plants like java moss around, improving their hiding capabilities (and, depending on your tastes, astetics) further. The texture of the object has many groves and pores for bacteria to grow in, allowing a biofilm to build up that the shrimp will enjoy picking at. They are made of PETG, a material that wil not degrade in water and will leach out no dangerous chemicals.

They may release bubbles when first out in the tank, this is normal. It also may take the shrimp a few days to start using them, that's simply the time it'll take for the biofilm to grow on them.