Pat, I agree with some of the advice your getting here. Just wanted to say this. I have a similiar company to SE just not as big. However I feel they provide true scietific information about the pond. The recommendations based on their results mimic mine. My point is from information provided listen to what they have to say. Talk with them to better explain the "why" part of recommendations. Others here have some points but have a limited data source to draw from and I do not want them to lead you in the wrong direction.
