Magnet algae cleaning question

Flipper magnet cleaner works great and had a scraper for those tough spots and you don't have to take it out of the water to flip it over.

I have the tunze algae scraper. I got the large one. I love this cleaner because the only part that touches the glass are the blades. That means that it will not be able to pick up sand like some of the other ones. It also has a very small form factor so it looks good when you leave it on the glass. The blades do a good job removing all of the hard brown stuff and even smaller specs of coraline algae. The outside magnet does not cover the view of the blades so it makes it easier to see what you are trying to scrape off.  There is the option to use a metal blade but I have not put it on yet. There is so much that I like about this magnet.  

I use a small mag float that seems to work pretty well.