Bold, rare, and undeniably elegant, the McCullochi Clownfish (Amphiprion mccullochi) is a true gem in the saltwater aquarium hobby. With its deep brown to almost black body, crisp white head bar, and white tail, this clownfish has an exclusive look that's unlike any other. Native to the remote waters around Lord Howe Island, the McCullochi Clownfish is a prized find for aquarists seeking something unique. Their semi-aggressive nature makes them a better fit for experienced hobbyists or those with larger aquariums. Whether hosting an anemone or patrolling their territory, these clownfish bring rare beauty and bold personality to any reef setup.

General Habitat & Tank Requirements:

  • Tank Size: A minimum of 40 gallons is recommended, but larger aquariums help reduce aggression and support long-term success.
  • Aquascape: Provide ample live rock to create hiding spots, defined territories, and a natural environment.
  • Anemones: Not required but can be a welcome addition. If added, ensure proper lighting and care for the specific species of anemone.
  • Substrate: A sandy or fine gravel substrate is ideal to replicate their natural environment, but McCullochi Clownfish have no strict substrate needs.
  • Lighting: Not a major factor in keeping clownfish. They'll do well in aquariums with low to high light.

Water Conditions:

  • Temperature: 75°F to 80°F (23°C to 27°C).
  • pH: 7.7 to 8.5.
  • Specific Gravity (Salinity): 1.020 to 1.026.
  • Water Quality: Maintain ammonia and nitrite levels at 0 ppm, and nitrates below 20 ppm.
  • Filtration: Employ high-quality filtration, such as a protein skimmer, to ensure optimal water quality.

Diet and Feeding

McCullochi Clownfish are omnivores that benefit from a varied diet rich in both meaty and plant-based foods. They readily accept a wide range of foods, from frozen preparations to quality pellets and flakes. Offering a balanced diet promotes strong immune health, enhances their natural coloration, and keeps them active. Controlled, regular feedings also help maintain pristine water conditions.

Behavior and Compatibility

McCullochi Clownfish are semi-aggressive to aggressive, especially as they mature. Their behavior is similar to other species in the Tomato Complex, making careful tank mate selection important for a peaceful environment.

Some Compatible Tank Mates

  • Fish: Tangs, Wrasses, Angelfish, larger Gobies, and Blennies are good companions. Avoid housing them with other clownfish species or very timid fish.
  • Invertebrates: Generally safe with Cleaner Shrimp, Hermit Crabs, Snails, Urchins, and other common invertebrates.
  • Coral: Reef-safe but may select a coral host, sometimes causing irritation.

Behavioral Notes

  • Territorial Nature: More aggressive than Ocellaris and Percula Clownfish, McCullochi Clownfish may claim an area and defend it vigorously, especially in smaller tanks.
  • Pair Dynamics: Like other clownfish, they form a hierarchy with a dominant female and a smaller male.
  • Tank Size Considerations: Due to their aggression, a larger tank with ample swimming space and hiding spots is recommended to minimize conflicts.

Health and Maintenance

Perform regular water changes of 10-25% every two to four weeks to maintain water quality. Regularly test water parameters and observe for signs of stress or illness, such as loss of color, appetite changes, or erratic swimming.

Common Health Issues

Clownfish can be susceptible to common health issues in an aquarium environment such as:

  • Marine Ich: Identified by white spots on the body and rapid breathing.
  • Marine Velvet: Similar appearance to Ich but more severe, causing a dusty, velvet-like appearance on the skin.
  • Bacterial Infections: Open wounds from aggression or handling can become infected, leading to redness, swelling, or ulcerations.

Maintaining excellent water quality, providing the right nutrition, and giving the fish a stress-free environment can prevent most health issues.

 

Single McCullochi Clownfish
Pair of McCullochi Clownfish