Tunze has a new magnet cleaner you can drag through the sand and it won't put up sand and scratch the glass. Instead of pads it uses dual scrapers on each end.
Thanks for mentioning this. I did not know what you were talking about. But I just saw it the other day and did some reading on it and will be waiting for it to become available.
http://reefbuilders.com/2014/06/05/tunze-care-magnet-designed-simple-brilliance/
https://www.youtube.com/watch?v=xLvIcCu7mUQ