Dave,
Thanks for the response. My goal is to have a nice healthy pond. My definition of that is as folllows:
1.Occassional fun fishing . Not a food source.
2.Maintain a good environment for the wildlife.
I have to wonder if I should invoke the "Dont kick the sleeping dog" phrase. The pond may be fine the way it is, thats the issue, I do not know that. Trying to find people to help answer the question is an extremely hard job here in Maryland. I have not had any fish kills, except for the Blue Heron feeding. But I do realize it is its own enclosed world. I have to wonder what the fish are eating, I guess the strong survive. By the size of those Koi it looks like there doing fine. I would of expected to see some vegetative growth in the shallows on the flats, but there is none. This may be fine, once again I do not Know. Should I add small bait fish, structure, or do nothing?
With regards to the checkbook, I feel it is worth the investment. I enjoy and respect the environment. A pond in Maryland is a total treasure. The state will not allow any new ponds to be constructed do to the trout streams. I have a good friend who is an engineer for the state who told me their has not been a pond approval with out an act of god. Hey, whats a couple a thousand between me and the Fishsss! :p
I knew the pond would be a complicated issue, just not to what extent. Then I go back to the old its been there 16 years, something must be working. The owner before me did nothing except build it and stock it.
I found an eel in the spillway, add that to the list.
Thanks,
Ron