Easy Blade scraper
This product has been around a while, but I didn't want to get it until it had its own cleaning magnet... So I finally got one! I try to never use anything that will scratch the glass in my tank, but occasionally a razorblade is needed, and if I'm going to use one, I'd prefer to use this type.
The scraper comes with one razor blade (double-edged), but I also got a 10-pack for back up.