I’m also going to make this readable e-book available in print format but you can also read it online. It’s just 14 pages and there aren’t images. It’s succinct and updated per 2019
What you’ll see is a book(let) that steps you through the “process” I’d actually engage on a house-call to your pond if you called me. Twenty assessments
Click the picture of the book below, and you’ll be whisked to the online, readable version. Bookmark it for later this year, in the Spring if your fish get sick.