Thanks for your help guys/gals! I think I am going to try the approach of skimming the tank like crazy, pulling off as much as possible, using kalk paste and 3 days with the lights out..

This is about everything that people have suggested on the thread. I figure if this does not work then I will try the angel. And if none of it works.......... well, I guess I will have to grow some hair just to pull it out!!