Tired of cleaning your round aquarium glass? Bummed because there isn’t a mag-float for the job? Worry no more. The Mag-Float 20 is sure to cure your round glass needs. Just like the normal mag-float, this sweet tool is made for round aquariums. Retail is about $10 and available now at most LFS and online. For all round/fishbowl tank sizes having a maximum surface thickness of 3/8″. Safe on glass or acrylic. Measures 2″ diameter x 1-1/2″.