I will never ever buy another magnet scraper that does not float. Seriously why do they even make them that don't? I got a second hand Tunze magnet once and as I rounded a corner it fell. And it was heavy too. Oh and those sharp corners for no reason. Yeah it landed on an 8" long tent plate fungia. Of course my plate died in a few days. That really sucked. magfloat makes a huge industrial magnet that cost about $120 online and it will fit your tank. It's about 6" long and 2.5" wide.