I have no idea what they are. it has been in mytank since i got the LR and never grew or anything, last week i noticed that it had split into 2 and today i noticed the right one has split again. They look like little bubble tip anemones
majanos arent too bad but they can reproduce quickly and sting corals so I'd say to nuke it. a syringe with boiling water or lime juice should work... if not, kalkwasser would definitely do the trick