Two (2) Purple Serpent Starfish for Saltwater Coral Reef Fish Tank Aquarium Care Level: Very Easy | Size: 2-4 inches Diet: Detritus, Meaty, Sand Sifter Compatibility: Completely Safe with all Fish, Inverts and Coral 100% Live Arrival Guarantee. See Description for details Orders over $149 Receive Free Shipping. Build your order from our store and save.