How big are they? While they do look like cloves, I also have something similar in my tank thats about 1/4 the size of cloves, that are NOT cloves (haven't bothered to ID them yet though, and I have seen plenty of clove variations), and look very similar.
If they are the same size as mine, I'll dig deeper into the library here for an ID.. I just never bothered to with mine because its not aggressive, and does well where it is. (Mine came as a HH with another coral)