Hi, yes I have an API test kit for the Cupramine and it looked between 40-50 but I will say that it's hard to tell color degrees on kits for me. I did follow the Cupramine dosage instructions and this fish has been in one week. I just did a 13% water change and added Bifurin+. I didn't run any carbon to remove copper prior to as some locals thought it could be a bacterial infection. I also read the two could be used together. I'm not having luck finding images of copper sensitivity (have any?). As the fish doesn't seem stressed and is eating I'll do another water change tomorrow (so another 13% = 26%ish so copper should be down some). I'll also add more bifurin if everything looks ok - per its instructions. If you have any additional advice, please let me know. You're the second that mentioned copper sensitivity... i'll look for images more.