Ok, so this morning the green water was gone. I've attached two pics from last night, including the original on the thread, and four others from today. Completely different. You can see some of the existing grass from the original dam under water in a couple of pics.
Is this change in the water a bad thing? Again, we are going to do an Alum treatment in the next couple of weeks to clear the muddy water before we begin our stocking program.