Pond is 1/2 acre in size and 3 years old. This is the third season I have started the aerators and never had this happen before. Pond was fairly clear two days ago and then I started the aerators (1/4hp gast, two aerator heads in 10 ft of water at opposite ends of pond). I woke up the next morning and the water is very muddy in color. I don't have a clue what happened or if to worry about it.

Its not how well you do something,
Its how well you look doing it!