What is a Clean Up Crew? Since the beginning of reef keeping the name clean up crew or reef cleaners has been used to identify a team of invertebrates that help to keep the aquarium algae and nuisance free. Royal reefs carries the most productive invertebrates that anyone would want on their side. Blue leg hermits, emerald crabs, turban snails and many other invertebrates are mixed into different groups to target specific algae or nuisance material. Just like the ocean, every aquarium goes through its cycles or phases in bacterial growth, especially newly established aquariums. Clean up crews are a effective natural way of eliminating or attacking these nuisance algae since many prefer avoiding chemical additives to take care of these growths.