So if using rare earth magnets on the inside of your aquarium, not sealed in anything, will they leach anything 'bad' overtime?
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How about liquid plastic electrical insulation that tries to a soft ruberry consistency, or a simular product that is used to coat tool handles for a soft grip. I do not know if they are reef safe but you can control how thick it is, and they would be water tight.and sold at most good hardware stores and big box home improvement stores.