A couple of days ago, I took one of my Flipper Algae cleaners that really isn't good for anything except lightly cleaning the glass on the front of my tank and I super glued a disposable razor blade to it used for window cleaning. Oh, it is amazing how well it cleaned my glass. One caveat is that I need to take it out of the tank when I'm not using it but it was really amazing how well it worked. I can't believe no one hasn't made one that you can use disposable razors in ONLY GLASS AQUARIUMS. I also took care not to get around the silicone.