The Macneill's Basslet, Assessor macneilli, features a deep navy blue coloration with its fins lined with a lighter, more electric, blue. Like other Basslets they should not be housed with another Basslets to avoid aggression, but can be kept safely and peacefully in a reef tank with other tank mates. 

Corals and larger invertebrates like shrimp are safe from this Basslet, though they will consume very small invertebrates such as amphipods , isopods and copepods. Diet should include a variety of live or frozen mysis shrimp and vitamin enriched brine shrimp 1-2 times daily.