Holy crap, this thing is bad. I picked it up off of ebay for $37.00 and knew I got a good deal. I've heard good things about these magnets, but I never expected this. I slapped it in my 40 gallon tank to test it, I could barly move it. The glass is way thinner than what the magnet is rated for. Even on 1/2" acrylic you will get a workout trying to clean. On the instructions, it says not to put the magnets together because you may not be able to get them apart. :unsure If you are using one of the cheap mag floats, do yourself a favor and buy a real magnet.



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