GSP bad for Millipora?

[intarsiabox]

I have a little millipora frag that is growing but a few branches have now come in contact with some GSP. The tips are getting white in these areas. Is the GSP just rubbing the millipora polyps off? Does GSP emit any toxins? I didn't think it did but the head of my frog spawn coral that is closest to the GSP also isn't doing so great.