The Blue Assessor Basslet, also referred to as MacNeill's Mini Grouper or Macneill's Assessor Basslet, is entirely dusky dark blue. This is an excellent choice for reef aquariums.

For a single Blue Assessor Basslet, provide at least a 30-gallon tank - larger for more individuals and plenty of rock caves for hiding. Due to its aggression and being territorial, it is best to keep only one male Blue Assessor Basslet.

As a carnivore, the Blue Assessor Basslet will thrive on a diet of meaty foods such as finely chopped fresh or frozen marine fish, squid, mysid shrimp, vitamin-enriched brine shrimp, and frozen carnivore preparations. Feed at least twice a day.