Day 3 in my experiment.
All the jars are the same except for the Lime jar. The lime settled to the bottom and the water cleared quite a bit. About the same as the vinegar jar. In both cases, I'm assuming that the water cleared because the plankton couldn't live in those environments and died.

I do not fertilize but almost all the water entering the pond is from run-off from fields, yard, and garden. I can't do much about that.

Is there something else I can add to the pond that will slow down plankton/algae growth without hurting my fish? (sunfish/blue gill).

How about microbes?

Would small fish like FHM help? How about invertebrates? Are there any plants that would help clear up the water somehow?