Hi,
I would say the water quality is pretty good, since the pond has trout, and they require very good water quality, high dissolved oxygen, low temps, etc. I do use a few treatments that are supposed to increase clarity and remove much, and they seem to work very well. I try to remove as much decaying matter as possible, although it isn't easy with such a deep pond all around (it used to be a quarry).
Do you believe the extra fish that are there now will put pressure on the amount of oxygen, therefore, causing there to be issues with the trout and other animals?
Thanks