Assessor macneilli, commonly known as the Blue Devil Basslet, is a small, peaceful marine fish prized for its vibrant blue colouring and calm temperament. This species is well-suited to community reef aquariums and is generally reef safe, making it a popular choice among UK marine aquarium enthusiasts.
Temperament and Compatibility: Assessor macneilli is a shy and peaceful fish that coexists well with other non-aggressive tank mates. It is best kept with similarly sized peaceful species and avoids larger predatory fish. This basslet is not known to bother corals or invertebrates, making it suitable for reef setups.
Diet: In captivity, Assessor macneilli thrives on a varied diet consisting of small meaty foods such as mysis shrimp, brine shrimp, finely chopped seafood, and high-quality frozen or prepared marine fish foods. Feeding should be done 1-2 times daily to maintain optimal health.
Tank Requirements: A minimum tank size of 75 litres (approximately 20 gallons) is recommended to provide adequate swimming space and hiding places. The aquarium should offer plenty of live rock or caves to mimic their natural habitat and provide shelter, as this species can be shy.
Water Parameters and Environment: Stable marine water conditions with a temperature range of 24-27°C, salinity of 1.023-1.025 SG, and pH between 8.1 and 8.4 are ideal. Moderate water flow and moderate lighting are suitable, as Assessor macneilli does not require intense lighting.
Origin: Native to the western Pacific Ocean, particularly around coral reefs in the Indo-Pacific region.
Overall, Assessor macneilli is a hardy, peaceful basslet that adds vibrant colour and interest to marine aquariums. Its reef-safe nature and manageable care requirements make it an excellent choice for both beginner and experienced marine aquarists.
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