Redear are primarily benthic feeders, which means that they eat things living on the pond's bottom. Midge larvae and burrowing mayfly larvae are commonly found in their guts.
Whether or not to stock more depends on your ultimate goal and the size of your pond. Others visit this forum more frequently than I, so I'm sure someone will chime in. In addition to providing information on the size of your pond, it will also be helpful to know if you stocked other species of sunfish (e.g. bluegill) and how many you stocked. These two tidbits of info will get you a fast response.
Redear are a great fish. They can be tougher to catch than bluegill. They are pretty finicky, but knowing their "niche" (feeding on the bottom) will help your catch rates. They also tend to not overcrowd and stunt as frequent as their close cousin, the bluegill. They usually exhibit pretty fast growth rates. I really like catching and eating them.
