Description:Connects the pump of increasing oxygen， the shell can moves and bubbling， give a beauty of dynamic for fish tankSafe and non toxic for use in both freshwater and saltwaterThis would create a nice underwater landscape to give depth and interest to your fish tank or AquariumNote: If you wants make the shell move， you need you add a pump of increasing oxygen by yourselfSize (H x W): Approx. 7 x 9cm / 2.75 x 3.54 inchMaterial: ResinColor: Show as the picturePackage Includes:1 x Shell shaped Aquarium Decoration