I lucked out finding the perfect suction cups, at n Axman Surplus Store, they originally had some metal hooks but were easily removed. The hole sizes for the aluminum bar was chosen to be small as possible but still allow the suction cup nipples to fit into, but not come back out.
To start, a coat hanger was used to get the basic dimensions and angles figured out, as it is easy to bend and change to fit the aquarium. The dimensions were used to cut and bend the 1" aluminum bar. The end was notched and filed smooth for the lamp cord to fit into. Three holes were marked, drilled and tapped to allow screws, that will hold the lamp cord. The 2" aluminum bar was cut to length, the ends rounded and filed smooth. Marked, drilled and filed the holes for the suction cups and the center for some pop rivets. Sanded and painted the parts separately, with a green to blue fade, gave it a rainbow-glitter clear coat(some Krylon brand paint, pictures don't show it, but it is quite neat) Pop riveted the 2 painted pieces together and forced the suction cups in to their holes.
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