I have some branching hammer about 4 heads 1 of them has 2 mouths and a "bubble". Another has 3 mouths and a "bubble" in the center. The two heads are obvously splitting the question I have is, is it normal for them to have what looks like a bubble in the center between the mouths when splitting? Sorry camera is broke cant post pic. other then the "bubble" the look very healthy and are growing very fast. Its been years scence ive had any lps corals and cant remember if this is normal or not.