Magnets

I've seen people coat them with silicone. If you get these magnets, you might want to get #7 or 8 on that page. They will work with thicker glass. Once you coat with silicone and attach to something like the maxijet holder, you'll have at least 3/8" and maybe closer to 1/2" to go through depending on the thickness of glass in your aquarium.
 
I would definately coat these in something if you plan on using them. I could imagine that it would be easy to crack the glass of the tank installing them if they are not coated in rubber or silicone.
 
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