Note that the impeller design for moving air, is different than a propeller, which is specifically made to move water.
...but don't let that deter you...
If I was you, I'd seriously trim the blades. Cut 1/3 of the width on the leading edge, and 1/3 off of the trailing edge. That should fix you right up. If you want to get fancy, give your propeller a nice curve, like a submarine prop.
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