HV --
You should be able to have large catfish and large bass at the same time. In both cases you will need lots of food and forage, mostly in the form of bluegills. Where you are at, you should be able to get and successfully raise coppernose bluegill, which are heartier and grow somewhat faster than pure strain bluegill. They will become your food base for the bass, and to some extent, for the catfish. They need to be fed, either through keeping your water very fertile, or through feeding on a regular basis. To get big bass, you will have to keep their populations down, and keep the population of the bluegill real high, which will result in small bluegill.
You can also add redear sunfish. They will not compete with the bluegill, and they will provide some forage for the bass and catfish. They can be a little difficult to catch, but they grow bigger than bluegill. They just aren't as prolific. They also are the best way to keep black spot, white grubs, and yellow grubs from attacking your bluegill and bass.
