Thanks for the info due to my 90 being built in a load bearing wall I had to place a header above the tank which prevented cabinet doors and easy access to the front, so I have had issues scraping my front glass and now I have a potential solution without disturbing my tank terribly.
There is a cheap piece that attaches to the top of the mag float and the blade screws into it. It is very inexpensive. A large float and this piece will work fine. Scrapes coraline very well.
If you're talking about this new product, it's worth every penny. I had the old glue on and this works a lot better. It is expensive, as are the replacement blades, but it's worth it, IMO.