(2) Live Horseshoe Crabs (Small) for Saltwater Reef Fish Tank Aquarium Crab Care Level: Very Easy | Size: 1-2 inches Diet: Detritus, 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.