The Horseshoe Crab is very unique crab that likes to dig through sand beds/substrate in search of worms and other debris. It will work nonstop at moving around the sand bed and substrate looking for food. They are reef safe but as they grow and get to adult size they can be harmful to small fish or invertebrates. When they are small they are fun to watch them move about the aquarium and clean up the substrate.
All invertebrates have an arrive alive guarantee.
Due to variations within species, your item may not look identical to the image.