Small shrimp, fish, and other animals naturally seek out seclusion from time to time to ease stress and avoid predation. Small shrimp, in particular, are vulnerable when they shed their exoskeleton, and female shrimp carrying eggs often seek out dark areas to protect themselves and their eggs. Without refuge, it is common for females to abandon their eggs. Aquavitro shrimp enrichment accessories are ideal for providing this type of refuge. In addition, they can act as a substrate for fine algae and or bio-film to develop which are considered important food sources for many small shrimp. Ideal for providing refuge. Acts as a substrate for fine algae and or bio-film.