Hey Greg! I do not know of the invoices that you speak about, but keep in mind that a pond can be stocked over the years by animals also. Birds are terrible about dropping fish eggs and diseases into ponds. We treat hundreds of ponds each year that have bacterial infections from this very thing. As for your questions:

#1. We work alot with the University of Georgia Diagnostic division, and have had alot of success adding calcium to the pond to raise the hardness levels. Now once again please keep in mind that every customer's pond is different, so we can not predict the EXACT reaction. The hardness can raise a little, a lot, or be absorbed into the soil. We are only here to make recommendations based on 40 years of experience.

#2. 1 catfish and one largemouth bass for every 5 bream is our current balanced recommendation. Sterile smallmouth bass go 1 to 3 (based on 1000-3000 bream to the acre). Before you jump on the word "current" let me remind you that science is an ever changing thing. That is the reason we have the number of ponds that we do on our farm. We constantly experiment with these ponds to achieve optimum growth and quality in the fish. Changing stocking numbers is just one variable in the ever changing scientific method. We also admit it when we make a mistake, and there have been alot of those. That is how we all learn to better things.
By the way, may I ask your profession please? You seem to know just enough. Maybe we can learn from one another.

Do fish actually kiss?