CAB

John, I have the same problem interpreting the test strip colors. GH results are a magenta with no matching color on the given scale. I can't even use the value ( as opposed to Hue,) as it is lighter than the colors on the chart. Messaged the COOP a while back. It was suggested my GH was over 300 ppm. I'll try using other test

WyoTrucker, I had a similar experience with an established tank housing a group of a dozen blue dream shrimp and a dozen amanos. I added the recommended dose of Easy Iron and the next day six of each died. No water change associated with the dosing, until after the die-off. A few more died over the next days. I couldn't find any other problems, just stopped using Easy Iron.