If you are looking to conquer hair algae, detritus, and leftover food in your saltwater setup, look no further than the ultimate reef janitor. Marine hermit crabs are tireless workers that constantly forage through your sandbed and live rock, cleaning up the tight spaces that bulkier filters completely miss. From the peaceful Blue Legged Hermit to the striking Scarlet Reef Hermit, these fascinating invertebrates add non-stop mechanical utility and quirky personality to any marine ecosystem. Hermits Crabs