Ok to answer questions:
I *do* have an aerator, wind driven, SHOULD be sufficient for my little pond as the wind in Kansas is nearly always blowing!! Have had a few windless days but they are outnumbered by the days there IS a breeze. Stone was down in the deepest part.
Water color: green. Kind of a transparent dark green, don't really notice it unless I scopp a bucket and pitch it out. Used pond blue when first filled in April, again in July.
Windpowered aerator operates, well.. constantly as there is wind. One compressor cycles 24 hours, this was a backup when I discovered the low DO and shrimp accumulating along the shore. The other compressor is gas driven; it runs about 4 hours and therefore I can't get up at 2 am to refill it with gas. It also was backup due to the low DO.
Even with the 3 methods of aeration I am getting a MAXIMUM reading of 5 mg/L DO (titration).
Muck is on the bottom - kind of a green skin to it but when disturbed reveals a slimy, black, goopy, stinking slop. Oh.. and LOTS of water bugs.. LOTS.. apparently not enough MOVEMENT to deter mosquitos.. have some red colored worms, water boatmen, huge carnivorous diving beetles and others, including damselflies and mayflies.
I don't have a filamentous algae problem, there is very little algae actually other than that contributing to the green tone of the water.
pH is 8, alkalinity was 170 mg/L (I think that as the right measurement) temp maxed out at about 72. Ammonia, nitrates and nitrites were extremely minimal.
Appreciate the suggestions!!
