I Would just keep an eye on all the others and make sure they don't develop ick if that was what it was if they do you need to do a treatment of a copper medication or hyposalinity. Good luck with the other hope you have no more deaths. Keep us informed. Oh and both the treatment methods are not invert safe so anemones and corals need to be removed for treatment or the fish need to be removed. Just keep an eye on em. Hope it turns out well.
Never argue with stupid people, they will drag you down to their level and then beat you with experience.