Northern Studfish (Fundulus catenatus) maybe?
Northern hog sucker?
Dont know much about Fundulus sps. so I couldn't tell you. Looks like a northern hog sucker but they're not present down there.
From pictures it looks to be one. According to some sources online though it is native to Alabama, Missouri, Oklahoma up to Minnesota. So I guess it is possible it made it's way in to Georgia...
Oh, oh, then that's probably what it is.