I have a pond with catfish, brim, perch, and bass. the pond was there before we bought the house.i am thinking about taking out all of the oxygen in the lake to kill all of the fish to build a great bass lake. is this neccessary? should i shock the lake first and see how many fish of each kind are in the lake? there are kentucky bass in the pond, if i add some florida bass they will crossbreed from my understanding. anyways, i want a great bass fishing lake...what should i do? thanks......