After having my live rock for about 2 months I noticed this in my tank. It started small and there was only one. The are a total of 4 now on this rock only. They aren't directly by each other either. I have done a lot of searching and haven't been able to identify it yet. This is what it looks like opened. If you brush it with something it will close up and looks like a red dot. Does anyone have a clue what it might be?
