Cholla Driftwood is the dried husk of the Cholla Cactus which is commonly used in shrimp tank.It provides best shelter for shrimp while also stimulating the growth of soft film which provides a source of food to shrimp and baby fish.It can also be used to attach mosses, Marimo Balls, Buce, Anubias, or other plants to create a natural looking drift log in your aquarium.