I also agree with greg, I would not hesitate to introduce the fatheads. Your bluegills will benifit from having them to forage on. They will also have a chance to get a jump start on the bass. Minnows have plenty of positives to a pond as long as you do not try to intoduce to many of them. In your case I do not believe that you will add more than 100 ponds per acre that we use on the ponds in Wisconsin. We have seen some great grow rates on the Hybrid Blue Gills as well as the bass that we put in. The advice of waiting on the bass is great advice as well. Good luck and hopefully you will invite all of use to come and fish when it is all done.