The fish now live through the winter. -Paul Garner
For a budget approach to pond aeration, here is what I have been doing. This is the kit I bought about 9/2010 from Peak O2 (formerly Western Ponds). It consists of a Danner AP100 pump, sinkable tubing, two diffusers and was equipped with a manifold.
The pump ran near continuous for four years, and was refurbished and ran another three years. The older manifold had cracked, so I recently replaced it and purchased another pump.
P.S. The fish now live through the winter.