Thanks again ... concerned about the O2 levels alredy. this pond has been neglected for years and has, what seems to me, a lot of "compost" in the bottom, leaves, etc. I see alot of fish (I'm guessing minnows) piping like they need more air, so I'm already thinking the O2 levels must be high. This is why I thought some aeration method might be useful. Any thought on this?
