This small ceramic shrimp tube is a shrimp enrichment accessory designed to provide shelter and refuge to the shrimp and small fish living in your aquarium. There are a number of reasons why a small fish or shrimp would seek seclusion. Among those include:
Avoid general predation.
Seeking shelter after molting.
Protection for mothers and their eggs from predators.
Additionally, this tube provides an attractive surface for algae, which is a nutritious food source for your shrimp.