If your pond is Redear dominate, you're probably having a tough time getting the Bluegill to establish. In ideal conditions, Redear may lay between 15-30 thousand eggs. Redear spawn in March in the South, May farther north. Bluegill spawn from April on. Cull a few...I'm guessing that you see stunted Redear growth, and that they are robbing the Bgill nests from the start. I also suggest that you add 30 or so 5+" bgill adults to jumpstart the food chain.