Caracanthus unipinna, the Pygmy Coral Croucher, is rare in the aquarium trade and is usually only found as a hitchhiker on Acropora corals from Fiji. It is the color of a newly minted penny and only grows to about 1.5 inches. It is similar in care to other Caracanthus, but due to its tiny size should be kept in a small aquarium no larger than 10 gallons, as it will get lost in a larger reef tank. It feeds on Amphipods, but enriched live adult Artemia and small frozen mysis can supplement its diet. It is peaceful and can be kept with most other small, peaceful fish and inverts.