Here are a few things I would add.

For the size of the pond you may have too many fish.
I qualify this because you didn't say the total length of the fish.

I see that the pond is aprox. 1200 gal. The actual size of the pond would
help is it deep enough and circulating the water properly .

---- Bog --
The "bog" is a good idea. But.
There are some things you will want to check on.
Size, water flow, amount of water, soil, plants, etc. There is a major
difference in the acid/ alkaline levels.
Do you want a "bog", "fen", or "marsh"?
There is a definite difference between these three. For example;
A bog is acidic and over time turns into peat and then turns into coal.
(none of us will be around to see this)

I have a 1700+ gal. pond and filter it through two different marshes.
There is 7 fish for a total of 55 inches. I have hardy plants that come
back up in the spring. Cattail, Japanese Iris, Papyrus, etc.

---- Barley grass --
It's true, throw away the barley grass. It takes too long to 'activate'.
By then the fish have eaten at it, or it's broken down and gets in the
pump or waits for you to clean it out come fall.

---- Salt --
I have not seen and good or bad points about salt use. Using a marsh may
have something to do with this. I will be doing more chemical research on
this.

---- Tea Tree ---
I like natural cures so I use Tea Tree extract. People use it on
themselves and animals.
There is a caution here. http://www.messybeast.com/teatree.htm


Remember. We are all first timers and none of us was born with the
information.
I'm sure that everyone that has worked a pond has sent their fair share
of fish and plants onto their next life.
Hang in there.