What size is your tank and do you have a sandbed at least 3" deep?
"The Yellow Breasted or Twisti Wrasse is dark blue gray in color and marked with rows of bright blue dots. There is a large yellow patch on the breast and face of the fish. Adults may have some pink coloration on the face and fins. Tamarin wrasses need a deep sandbed to burrow through. They will eat small bits of meaty frozen foods and browse for worms and crustaceans on rock and in the sand."
- from a site that sells them...