Thanks! And I don't think they'll be that expensive, either. I have to find a good supplier of bulk neodymium magnets, and once I jump that hurdle they should be in the mid-$30's. I have different shapes planned as well. I have two forms molded with test-casts pulled so far, and I want to have at least one large corner piece available. The magnet on the inside of the aquarium is embedded in the resin structure, and the outer magnet will either have a rubber coating or a machined plastic "handle." Either way, as Lois can probably attest to...these magnets are VERY strong. The bare outside magnet I sent to Lois would be a potential hazard to children, and could potentially break an aquarium if allowed to fly at the glass where the inner piece was located.
I'm looking at the patent process, and it's daunting. But I may get it started and test out with some local places here to see if there's any serious interest.