Well... if your wife is one of those that likes to see stuff and not just the beautiful inhabitants, then go see the GA's huge twenty-eight 15' tall protein skimmers and other big equipment, the mangroves, and the "how to" of a Public Aquarium, then by all means go on the Aquatic Adventures Behind The Scene Tour.
The Georgia Aquarium is really wonderful, however try to get there as early as they open so that you can enjoy it. 10:30-3:00 is their busiest time and it gets very crowded with strollers during those times.
Let us know what you decided about the Behind tour and what you thought of it after you've visited it.
Bob