RF, my short answer would be no.
That's an awful lot of LMB in a small amount of water, and the water quality alone could make it a ticking time bomb. Very few LMB ponds are self sustaining, so the time, money, and effort to make this work could be much higher than a larger pond.
IIRC, you had talked about building a larger pond on your property, so I might use the 700 SQft pond for forage for that one. Perpetual forage can't be overrated.
