Clown Coris Wrasse (Coris aygula)

The Clown Coris Wrasse, also known as the Twin-spot Coris, is one of the most dramatic examples of "rebranding" in the fish world. As a juvenile, it is a tiny, adorable white fish with orange spots. As an adult, it transforms into a massive, dark, and powerful predator with a completely different personality. Due to its eventual size and destructive habits, it is considered a fish for expert keepers with very large systems.

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Key Information

• Common Names: Clown Coris, Twin-spot Coris, False Clownwrasse

• Scientific Name: Coris aygula

• Origin: Indo-Pacific (Red Sea to the Line Islands)

• Max Size: Up to 120 cm (4 feet) in the wild; typically 60 cm (2 feet) in captivity.

• Lifespan: 15–20+ years

• Temperament: Aggressive (especially as an adult)

• Diet: Carnivore – Specialist in hard-shelled invertebrates

• Care Level: Advanced (mainly due to size and destructiveness)

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Appearance: The Radical Transformation

This fish is a classic "trick" of the aquarium trade because the juvenile looks nothing like the adult:

• Juvenile: A stunning pearly-white body with two bright orange "bullseye" spots on the back and black spots on the fins. This stage is what is usually sold in shops.

• Adult: The white and orange disappear. It turns a deep blue-green to charcoal grey. A pale vertical bar often develops behind the head. Most notably, males grow a large bony hump on their forehead and a ragged, powerful tail.

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Behaviour & Tank Compatibility

• The "bulldozer": This fish is incredibly strong. As an adult, it will flip over large rocks and corals searching for food. If your rockwork is not glued or cemented together, this fish will literally "remodel" your tank.

• Not Reef Safe: It will decimate any clean-up crew. Snails, crabs, shrimp, clams, and sea urchins are all natural prey. While it doesn't eat coral polyps, it often accidentally breaks or kills them by flipping the rocks they are attached to.

• Sand Dwellers: Like most Coris, they bury themselves in the sand to sleep or when they feel threatened.

• Tank Mates: Must be kept with large, aggressive tank mates that can hold their own, such as Groupers, large Triggerfish, and Snappers. Any fish small enough to fit in its mouth will eventually be eaten.

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Ideal Tank Setup

• Tank Size: A juvenile can start in 150L, but an adult requires a minimum of 1,150L–1,500L (300–400+ Gallons).

• Substrate: A thick sand bed (at least 4–6 inches deep) is mandatory. The sand must be fine to medium-grained to prevent the fish from scraping its skin when it dives.

• Secure Rockwork: You must secure your rockwork with epoxy or rods. This fish is strong enough to cause a "rockslide" that could crack the glass of the aquarium.

• Feeding: Requires a diet of hard-shelled meaty foods to keep its teeth healthy. Offer whole shrimp (shell on), clams, mussels, and squid.

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Why Choose the Clown Coris?

The Clown Coris is for the hobbyist who wants a true "monster" fish with a high-impact presence. It is a hardy and long-lived species for those with massive FOWLR (Fish Only With Live Rock) systems. If you have the space to accommodate a two-foot-long predator that acts like a puppy (it is highly intelligent and can learn to recognize its owner), the Clown Coris is an impressive and powerful centerpiece.