There are only two in town. Aquarium Fantasies is in the Atlanta Crossing shopping center at the corner of Atlanta Highway and the Eastern Blvd (exit 6 on I-85 and head north). Wet Pets is up from Montgomery Mall on McGehee Road - probably the easiest way to get there is to go south on Eastern Blvd until you get to where McGehee crosses Eastern Blvd. in front of Montgomery Mall, then turn right and drive up McGehee. The shop will be on the left in a strip center with a True Value hardware on one end and a Subway on the other.
Aquarium Fantasies - much bigger selection of fish and corals, some frags (but if you're from Atlanta, you can get better much cheaper at Capp. Bay or the like).
Wet Pets - much smaller selection, especially of corals; somewhat higher prices.
If you can only fit in one visit, go to AF.
Just MHO, if recent posts are an indication, doubtless you'll get at least one other.
HTH, and enjoy the 'Gump.
Will