Sargocentron diadema, commonly known as the Squirrelfish, is a captivating nocturnal species prized for its bright red body and large, reflective eyes adapted for low-light environments. This medium-sized fish is best suited for experienced marine aquarists due to its specific care needs and temperament.
Care Level: Moderate to advanced. Requires stable water parameters and a mature aquarium.
Temperament: Generally peaceful but can be territorial towards conspecifics or similar species. Best kept singly or in a large tank if multiple individuals are desired.
Diet: Carnivorous. Feeds primarily on meaty foods such as mysis shrimp, brine shrimp, and finely chopped seafood. Feeding should be done in the evening to mimic natural nocturnal feeding habits.
Minimum Tank Size: A minimum of 120 litres (approximately 30 gallons) is recommended to provide ample swimming space and hiding spots.
Reef Safety: With Caution. While generally reef safe, they may prey on small invertebrates and should be introduced carefully into reef systems.
Lighting Requirements: Moderate to low lighting preferred to simulate natural crepuscular and nocturnal conditions.
Water Flow: Moderate water flow is ideal to replicate natural reef environments.
Placement: Provide plenty of rockwork and caves for shelter during daylight hours. They are primarily nocturnal and will be more active at night.
Origin: Indo-Pacific region.
Maximum Size: Up to 15 cm (6 inches) in length.
Overall, the Squirrelfish (Sargocentron diadema) is a fascinating addition to a mature marine aquarium, offering unique nocturnal behaviour and striking appearance. Proper care and tank setup will ensure a healthy and thriving specimen.



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