They are closed, so they are def irritated. It is def a majano though, as that is def a nudibranch. I would take your zoas and give them a good dip in CoralRX, or a similar coral dip, to get rid of them first. Do that several times, as there are most likely eggs in there as well. After the dips, if the majano comes back as it should, I would nuke it with some aiptasia-x or joe's juice. You should be square from there on.