Those corals look pretty stressed. Unless you've got a dedicated tank set up to QT the coral, I would just acclimate + dip (below is a guide from Tidal Gardens):
The proper acclimation of a new arrival is extremely important considering the amount of stress the coral has endured before arriving at your door. We recommend that the following procedure be followed immediately upon receipt of the livestock. The entire process is actually very simple and...
tidalgardens.com
I either remove the frag plugs or give the plug a good scrub with a toothbrush before it goes in the tank. I also check for stuff like Aiptasia and Majanos which dip won't do anything to.