i would not recomend putting crappies in that small of a pond. The bluegills and bass would be fine. I work at a outdoor store and there is a company in Wisconsin that sells game fish it is called the Gallon Bait company look them up and give them a call. But i really wouldn't recomend putting crappies in a small pond. I have heard that they need anywhere from 15 on up acres to survive with other fish.