I recognize water like that! Bright white side of split mollusk shell was only semi-visible under less than 2" of water. Not surprisingly, there was a big fish kill on the fairly large (50 acres?), shallow, private lake. Neighbors living next to lake are upset. Spent a bunch of time in the last week talking with experts from Dept Natural Resources, Agriculture, Public Health, Environmental Protection, and Corps of Engineers. Bad situation. May get worse before gets better... Anyway, based upon water color and my limited experience / knowledge, you're walking a fine line to a fish kill.

Seems like I heard a contributing factor was people using copper sulfate to kill off plants so nutrients took form of algae which is more likely to fish kill. Suggested draining down, killing off trash fish, revamping, and then planting plants to take up some of the nutrients so wouldn't be picked back up in form of algae blooms again or something like that. I may not be translating the essence correctly. If I am, then - longer term - if you can't control the nutrients going into the water, maybe you can add plants to control what uses those nutrients... Does that make sense? It's been a long week.

[Linked Image from i108.photobucket.com]