1 box shell macaroni; cook and drain 10 minutes in cold water. Fork in 1 can crab meat. Heat together: 1 can mushroom soup, 3/4 cup milk, 1/2 cup Cheese Whiz, 1 can mushrooms, and 1/2 green pepper (cut up - optional). Last, add 1 can shrimp or 1 box frozen shrimp, cooked and drained. Mix all together and let stand in refrigerate overnight. Bake at 350 degrees about 1 hour.