Hi, I'll tell you what I know of the Half Black.
They need a tank of at least 30 gals.
They need lots of places to hide and swim.
They like to eat, marine algea, mysid shrimp, Spirulina, and other meaty treats.
Semi-aggrisive towards others. Will not get along with other dwarf angels.
This is a fairly hardy fish, medium difficulty to keep. Keep with caution in the reef.
Hope this helps, Lisa