I read a post somewhere. I can't find it now.
They just took the rare earth magnets, poured some epoxy in a..... I think it was a pop bottle bottom or a film canister..... whatever I guess that will fit what you need and once the 1/4" bottom layer is poured, place the magnets in and cover completely with more epoxy. I'll try an find the link.
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150 G mixed reef. 
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