Why not have three silver aros? I've seen it work multiple times. Maybe three aros, and a catfish or stingray for the bottom? As this is a pond, the viewing will be from above. So you mainly want fish at the surface and which look good from above.
~A betta named Mowgli~;637250; said:A silver aro is too big in my opinion. It would take up a lot of the space...