After you have the magnets attached to the frag rack, try using casting resin.
I made a whole lot of frag racks with the eggcrate, neodymium magnets and casting resin.
I have a couple frag racks left from 6-7 years ago that are still usable.
Be sure to use a dye. I think uv rays break down the clear casting resin pretty fast.
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240 gallon soft coral tank
50 gallon lps tank
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