For 1/2" glass, my vote is for Algae Free Hammerhead Float, much stronger than the largest Magfloat and a bigger cleaning area. IT ROCKS!
You can get them at Premium Aquatics, Flying Fish or from the Algae Free website web page
I would check out Algae Free Magents "The Hammerhead Float" is a great magnet for 1/2" glass or acrylic. Its much stronger than the Magfloat and has a larger cleaning area than either the Magnavore or the Magfloat. You can get them from Premium Aquatics, Flying Fish Express or you can go to...
You could also try Algae Free's new Piranha Float, It works great and the inner piece floats to the top if it falls off. Premium Aquatics or Flying Fish carry them.
Algae Free makes a new floating magnet it's great! I use it on my large acrylic tank. Its called the Hammerhead float, I got mine at Premium Aquatics. I here there is another one comming out the Piranha float due out in the next few weeks too.
It zips right around the corners and the interior...
Algae Free makes the strongest floating magnet avalable its called the Hammerhead Float, it's acrylic safe. It is quite a bit more expensive IMO its worth it! Has a nice big cleaning surface and works great on my large acrylic tank.
Algae Free makes a good powerful cleaning magnet thats safe on glass or acrylic. They also have a new floating magnet that you can get at Premium Aquatics. www.premiumaquatics.com
I have the mag-float350 and the Hammerhead float The Hammerhead is bigger and much stronger.
Algae Free cleaning magnets go around corners and also have a new floating magnet that is much stronger than Mag-Float. You can get them at Premium Aquatics www.premiumaquatics.com or Algae Free www.aquariumcleaner.com.