The Medium Sergeant Major (Abudefduf sexfasciatus) is a visually captivating damsel fish native to tropical Indo-Pacific reefs. Recognisable by its distinctive vertical black stripes on a pale body, this species adds dynamic movement and colour to a marine aquarium.
Care Level: Moderate. This species is hardy but benefits from stable water parameters and a well-established tank.
Temperament: Semi-aggressive. Sergeant Majors can be territorial, especially in smaller tanks, so compatibility with other fish should be considered carefully.
Diet: Omnivorous. They thrive on a varied diet including high-quality flake or pellet foods, supplemented with frozen or live brine shrimp, mysis shrimp, and marine algae.
Minimum Tank Size: 120 litres (approximately 30 gallons). Adequate swimming space is essential to reduce territorial behaviour.
Reef Safety: With Caution. While generally reef safe, they may nip at coral polyps or small invertebrates, especially if underfed or stressed.
Lighting and Water Flow: Standard marine aquarium lighting and moderate water flow are suitable. Ensure good water quality with stable parameters.
Placement: Mid to upper levels of the aquarium where they can swim freely and establish territories.
Origin: Indo-Pacific region.
Maximum Size: Up to 15 cm (6 inches) in length.
Overall, the Medium Sergeant Major is a vibrant addition to community marine tanks with appropriate tank mates and husbandry.
