Frank, I will be glad to spec. out a system for you. These 2 guys have same small size and depth and need the same components.

How deep is your pond & how old, any vegetation?
How long would you like to aerate?

You may just want to go with a Vertex system sized for your pond; they dont have a system for these very small ponds, but are supposed to be the best. Check them out on the web, let me know which compressor it will use. What voltage and current draw.