That club member may want to ask what force and direction of water current is hitting the coral. Move the coral to a different place. Same goes for lighting.
How long was it in the bag? Did it get stressed by being too cool or too hot for too long. Did they wait till morning to place it in the tank rather than throwing it in the tank in the dark(works fine for me) and positioning it the next day.
Also what is nearby and what else is in the tank, like other LPS coral or is there an overgrowth of one kind of algae or Xenia that may be inhibiting the coral's comfort?
Yes, it is reason for concern after two days. And we don't know about the tank's water parameters, the age of the tank, etc.
"So much time, so little to do... no, stop... reverse that." Willy Wonka