An interesting addition to any aquarium! The horseshoe crab when young makes for a great sand sifter helping to keep your sandbed healthy and aerated. Be sure to provide them with wide open sand bed space and be prepared for them to grow quite large. When reaching a certain size they tend to slow down in growth, but will eventually reach over 12 inches in diameter. They spend most of their time scavenging so be sure to supplement with feedings of frozen shrimp, mussels, or squid.