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Magnets used in watrr

Trying to create a DIY magnet holder for my heater. The auction cups never work for me. Anyone know where I can buy magnets that wont rust in saltwater?
 
It all depends on the thickness of your glass too. Friend of mine does acrylic work and is working on magnetic racks and having tons of trouble finding one's that work on redsea tanks. I just hang mine into my overflow so I don't have to use suction cups.
 

I used these guys to make some magnetic shelves, and a lil silicone for just redundancy. You would have to purchase 2 for each magnet connection. The pictures looks like it's a set, but isnt.

I'm not 100% sure on this, but the magnet might mess with the thermostat if its close.
 
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