I'm using the algaefree great white magnet cleaner. So far I'm happy with how it works on acrylic. I've been using their smaller models on my glass tanks for a couple years and have been happy with them as well.
I wanted a floating magnet for 3/4-1 1/4",so I got a Mag Float 510A. I didn't know about Mighty Magnets. They do look really close to a Mag Float though.
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