Yes, that's very good. Make sure you can see the generalized circulation in the pond. 3/4 acre is a little bigger than my smaller ponds, but I think you should be OK. Experiment a little with the angles. Perhaps two nozzles could have the 5 degree orientation and two others could have zero degree and half of the exit hole above the water line. This gives lots of froth and lots of momentum to the water for general circulation. The concept is the same as an airlift aeration system, except the water is moving sideways in a circle instead of up and down from an airlift.
