Burgess Butterflies, or Burgess butterflyfish, are a rare and striking deepwater species that is one of the most durable aquarium butterflyfishes. It will accept most aquarium foods. It is a bold species that tends to spend most of its time in the open. It can be employed to clean live rock of glass anemones, however, it will also feed on some of the more desirable invertebrates living on the rock.
Highly rare and sought after, when available, you should jump at them.