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At this point, put the aquarium in and verify that the heights and clearances are to your liking. I have sufficient space above the edge of my aquarium to reach in and drop food without removing the glass top.
Having 2 "shelves" adds stability and good looks to your new coffee table. Using bolt cutters is a quick and easy way to remove the internal shelf area for your top / middle stabilizing shelf. Although I was too impatient, using a dremel or file or other deburring instrument on the remaining stubs from the cut wires would make the upper shelf safer. I recommend doing so if you have human young around who may put their hands on that part of the table. After placing that shelf, you can complete the support structure by placing rubber chair end caps on the posts.