This Purple Hairy Pin Cusion Urchin is a visually striking addition to any marine tank. With its vibrant purple color and unique spiky appearance, it is sure to catch the eye. Its small size makes it perfect for aquariums of any size, while its spines provide protection for other tank inhabitants. Hairy pin cusion urchins are excellent algae eaters and will keep your reefscape pristine. A must-have for any saltwater enthusiast looking to add a bit of color and character to their tank.