Driftwood has long been used in aquariums. Wood is full of good tannins that help prevent diseases and bacteria. In addition, wood is a feeding ground for shrimp and it also serves as a natural shelter.
In the aquarium a natural biofilm will grow on the wood. This biofilm will form a constant feeding source for (young) shrimp and other animals. This biofilm is constantly available which is important for young animals to survive.