Hard to say going by the photos. Do they have a single stalk, are soft and capable of retracting? At first glance they appear to me to be a type of coral.
Can you get any other photos? Those are very interesting, I do not think they are majanos, but I don't know what they are.
They almost remind me of little fragments of sarcophyton toadstools coming back from where one was removed from a rock, although the tentacles look to be too translucent.
well i dont have any pics yet but(Sarcophyton tenuispiculatum)but it seems flat on bottom no stalk. and has gone from one 2 five in 3 months. if that helps