Got you, Frank. I'm not sure if bottom aeration would do much good in such a shallow pond, as the lifting effect of the bubbles from depth is what does the circulation. Just how far is the electricity from the pond? any chance of running air line? you can run air thousands of feet without much loss. Surface aeration may be best, but water pumps draw a lot of current.

Why dont you look up Tea Lea, an aeration specialist on the forum and run the pond by him. Let him advise you. Whatever you decide, if you still need solar or electrical advise, I can spec. that for you.