3/4 of an acre pond is a bit on the small size for TFS or I would recommend them. GSH may be an option as they are native to north FL and have the possibility of doing well in a 3/4 acre pond. However, they will compete with BG for food. As TJ mentioned, lake chubsuckers(LCS) are native to north FL and are found in many BOW's in the state. They are a big part of the diet of many bass in FL. You can look into purchasing some from Todd Overton or attempt to wild collect some. Check this link out:
FL Lake Chubsucker Check out Todd Overton's info on LCS on his site:
Overton LCS