Best Magnet for large tanks???

Largest version is rated for 3/4" to 1" thick glass or acrylic. I have seen this on my friends tank and I like the design and you won't even notice if they are tucked on the side of the glass
 
got a tunze strong on 3/4 in glass, just perform awesomely. I never pass twice at same place cause some algae left. No fear of having sand stuck between glass and magnet cause its actually floating on the glass with a gap of around 1/16in, and only the scrapper are touching. And it comes with a plastic scrapper safe on acrylics.
 
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