I have these things growing on my live rock and I do not know what they are. I have had my water tested recently and have great water quality. If any one knows what these might be that would really help. The pictures aren't that clear so I circled the growth to help. Most of the growth circled appears to be some kind of tube worm. There are a couple of red polyps circled as well. I think these may be some form of aiptasia but again not sure.