Jb weld?

[boreddome]

I was wondering if it safe to use JB weld in a reef aquarium. Looking to do a cheap DIY magnet mod on my new maxi jet 1200 buy JB welding 3 little but strong magnets in place of the 3 crappy suction cups.
If JB weld is not safe was is a strong safe glue/epoxy?

 

[boreddome]

Also, do I need special magnets? I know they needed be strong for the glass but I'm worried if all magnets are all the same (home depot brand) or if I need to buy aquatic ones