The Electric Blue Leg Hermit Crab (Calcinus elegans) is a small but vibrant addition to saltwater aquariums, known for its bright blue legs with black bands. Native to the Indo-Pacific region, these crabs are both colorful and practical, often helping to keep aquariums clean by consuming algae and detritus. They’re popular in reef setups due to their size, coloration, and algae-grazing abilities.