Mitch I know you are an advocate of testing the water. I at first disregarded the advice from my pond store which was "don't waste your money" but was more than happy to sell me a kit. I bought it and also bought into what I read on the internet. Test your water blaa blaa blaa. I soon learned the value of a $12 dollar kit when I took my pond water into the county testing lab, a real lab. The results on my drinking water and pond water tests were not even close to what I had tested. If I had tried to "fix" my pond water I would have messed it up so bad I probably never could have gotten it better. Even if the test was correct I would have added things that any new pond owner would add based on what is always repeated on the internet. A pond is a pond and not a swimming pool. No one tests farm ponds and they do just fine for the most part. My pond store doesn't test its water and they are in the business of ponds so I don't test mine and the carp (koi) do just fine. Ignorance is bliss when it comes to nature. Let nature take care of itself and see how the pond goes. A pond keeper can get into more problems by trying to fix something that will fix itself. I do partial water changes, turn on a UV light when needed and listen to real-world advice. I believe in what I can see and what others have experienced. I do not necessarily believe in what is repeated over and over again. If a fish gets sick I'll get rid of it instead of trying to diagnose it from what non veterinarian advice. If my water looks really bad or smells really bad I'll drain it. I earned from a goldfish bowl when I was a kid that importance of clean water.That is really bad advice.
Water testing is very important to determine water quality.