[Im Lon 2]

I found one piece in my tank a few weeks ago.. I whacked it off and haven't seen it since.. I had never seen the stuff before. I have not noticed if it has come back or not. The good thing it was on a little piece of rock.. If it comes back I will just pull the rock out. But I have noticed I got a few frags, that is starting to get what I think is cotton candy algae on it.. It pink and almost looks like hair Algae.