Zoo Med Can O' Cyclops. Cyclops are a small species of Copepod that are the preferred food of fry and fish with small mouths. Fresh Cyclops are "cooked in the can" to lock in nutrients. Excellent for fry and small aquarium fish including Tetras, Barbs, Guppies, Danios, Bettas, Killifish, etc. Also great for small marine fish, invertebrates (including corals) and nano shrimp. Available Size: 3.2 oz