Is your tank new? I had some of that when my tank was new. It took awhile but it went away on its own. I donn't think it is harmful, but I didn't have any coral at the time. If it is really driving you nuts you might want to keep the tank out of dirrect or indirect sunlight. You could also keep the lights on for less time or leave them off all together.
Did it start off lighter in color? Because it could be cyano.
Once ours started to get thick....it looked kind-of dark purple, at about that point it started to have strings waving back and forth in the current.
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