This was an entirely new pond, not an enlargement of an existing one? And there is no other BOW that could flow into it, during a heavy rain event?
I'm with Ewest, the math is possible, but barely. At any rate, in my opinion you need some predators. I like the idea of some HSB also, but it's hard to beat the near guaranteed effectiveness of a few 8" LMB. Stay on top of any aquatic vegetation, don't let it become excessive.
That's a LOT of CC...
