Those of you with 19mm (3/4") glass.

[RRaider]

What cleaning magnet do you use?

 

[Nanook]

Tiger Shark Float.

 

[Nanook]

http://www.algaefree.com/

 

[jjk_reef00]

Magnavore are good also.

 

[Bello]

If you want something cheaper, but doesn't float --- TUNZE!