Just found this place, very interesting. I'm in Northern NY with a 6 year old pond. It's about 80ft. in diameter and 10ft deep in the middle. I have a spring that feeds it, it runs a 3/4 pipe full year around. The first year I put 25 brook trout and 25 rainbow trout in. 4 or 5 died, the Herons got 4 or 5 and I ate a bunch. There are now 6 remaining,(about 5 pounds). I feed them 3 or 4 times a week. If the algae forms on the surface, I made a skimmer to suck it off, works great. The water stays greenish, cloudy like. I've tried Barley straw, it helps some and have had mixed results. What about an ariator, or pump the water from the bottom of the pond to the top.
Tim
