Originally Posted by VaughnH

Unless you enjoy doing testing, calibrating the test kits, calculating how to correct what the test kits tell you, etc. you are much better off using the test kit for a book end, and not testing. If you have a problem the plants will very likely tell you about it much more accurately than the test kit will. As far as I can see you don't have a problem, so relax, enjoy pruning the plants, watching the fish, and keeping those books upright with the test kit.