Def. do at least a dip on the corals, but I would want to QT them. I don't want to contradict anyone about QT corals but I learned the hard way that they should be QT as well. I got red bugs from some acro, and I got ich from a coral as well. Even though I didn't add any water from the LFS to my tank the ich must have been on the rock because my fish were very healthy and I had had them all at least two months before I got a coral that I later found out was in a tank that had a Tang that was infected with ich
. All of my fish are in hypo as we speak and it has been very time consuming keeping up with the WC in that tank to keep the water quality up. Just a word to the wise about not QT coral as well. I don't know what dip would be effective to kill ich on the coral, but you would want to do a 6 hour interceptor treatment on it for sure IMHO.
Just my experiences in the last two months coming out here but I wouldn't want to go through this again.