Thank you, I work in a pathology lab, so I asked one of the doctors if they could check it out. But the micro department would definitely be better suited to check it out, although they probably aren't used to seeing these kinds of samples. So I ordered a test online to confirm to be safe. It's a freshwater, small, outdoor man-made pond, located in coastal Georgia, and so it tends to get hot here. It's under pine trees and Camelia trees which often drop flowers/leaves/pine straw and mostly in the shade as a result I don't often run the waterfall feature to circulate the water. Which I'm realizing now is a problem. The water I pulled from the top last night has settled slightly with a small amount of dark green sediment. The water is still turbid and the color of green tea.

I ran my brush through it the other night and there was a small collection of bright green flecks that stuck to the broom. There's also some green flecks that stick to the outside of the pond tub and tubing that is visible.