IMO take a minute and recap where you are. What are your goals? What is the capacity of your pond? You don't have aeration and are planning on stocking and heavily pellet feeding a lot of fish. Is your current go forward plan within the capacity of the pond to support? Will you potentially be facing water quality issues in a few months if you follow your current plan? The forum is great on answering questions but your situation has a lot of variables to consider. Maybe time to hire a pro (and I don't mean the guy that sells you fish) for a consult?