Shrimp Accessories - Tube The aquavitro Shrimp Accessories - Tube is the perfect addition to any aquarium housing various shrimp species. As with many smaller fish species, shrimp require secluded and protected spots in the aquarium as a way to avoid predation from other animals, protect their sensitive exoskeletons after molting and to aid in the breeding cycle. Often, when female shrimp are berried (have eggs) and do not have adequate refuge, the stress will cause them to drop and abandon their eggs. The tube structure is a long hollow cylinder with randomly sized and spaced holes across each side of the unit. Easily blending in to your established aquarium decor, the hollow tube gives a quiet, shaded area for your shrimp to rest and the holes offer free access and water flow through the inside of the unit. Additionally, these structures provide additional surface area that is ideal for the growth of development of fine algae or biofilm, which is a critically important food source for many species of small shrimp.