Thanks very much ewest for the information and sharing.

I have 18" of visibility as we speak which is right about where I wanted to be. The water has what I imagined as the perfect pea greenish tint. I don't plan to fertilize again for at least a few weeks and won't even do that if the visibility stays near the 18" mark.

Should I expect the water to get muddy again in the fall/winter now that I have addressed the clay turbidity problem? My guess is muddy runoff will undo what I have done over time and I'll have to resume measures to address the suspended clay. I'm hoping it won't take such a big amount to keep the visibility up going forward. A good bit of the gypsum I added is laying on the bottom helping me, right?