I say throw convention out the window and purchase a gorilla.
You could train the gorilla to blow into the aeration tube and occasionally throw some feed into the pond. Think how cool it would be to have a gorilla roaming around your property. If you trained in in security tactics you would also elimate trepassers and poachers. Purchasing banannas might be slightly more expensive than purchasing electricity for the aerator pump but you have to remember the cool factor of having your own gorilla.
If the gorilla resists being trained then you could use the gorilla to test whether or not people will talk about a 600 pound gorilla in the room.
All I'm saying is sometimes it's good to think outside the box.
