Hmm. I don't know then. Spawning in the home aquaria wouldn't be good. From what I have read it looks like pearling coming off the monti, then it fouls your tank.
If you really think it is spawning i would do a water change and make sure you skimmer is running.
I don't think they are, what you are describing i have seen my monti's do when something irritates them. Looks like strings all around the edges floating but still attatched to the monti?