ca1ore, were you able to keep euphillia corals after that? What I fear the most is what ever is killing these corals will remain in the tank and continue killing any euphillia I add. If my all euphillia corals die I will probably not buy new ones for couple of months to be sure, but I hope I can add them afterwards.
In my case ricordia were affected as well as the euphillia corals - though nothing else. Was quite odd. I went without both for a while; about a year if memory serves. I have subsequently been able to keep euphillia again, though have not tried ricordia.