You could open it up with a cutting disc on a Dremel and glue it back together. As long as you put the new magnet in the outside (felt side) piece it doesn't have to be 100% water tight.
I mixed a non floating Magnavore with a Magfloat so you don't necessarily have to change both magnets.
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Brian
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220g inwall 48"x36"x30"
110g mangrove refug/sump
Poison Dart Frog Vivarium
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