The Dusky Wrasse, Halichoeres marginitus, is naturally a passive wrasse species. The Dusky Wrasse requires a tank  with a tightly sealed lid to prevent escapes. A large tank with plenty of swimming space and a deep sandy substrate is also preferred.

The Dusky Wrasse will change appearance as it transitions from its juvenile stages to adulthood. Juveniles are often black with a white tail and white lines with occasional black spotting on the fins. As they mature, more red and green colors appear with broken horizontal striping across its body.