Originally Posted By: wbuffetjr
That is kind of what I thought. The DO just fell off a cliff. I was sitting over aprrox 20' deep water. Don't think I could have screwed it up but who knows.

I'm like the blind leading the blind, but that looks like a thermocline with accompanying drop in DO to me. I'm guessing you're getting incomplete mixing and thus still have stratification. Whether or not that's good or bad I really don't know.