Had a quarantine tank up with cupramine in it, we did a 30% water change and put a bag of carbon in. This weekend we brought home our purple tang and Desjardini tang. We put them in the qt and a couple of days ago I added half of the dosage of cupramine then yesterday I added the rest.... but I forgot we previously had cupramine in the tank!!! I tested the cupramine level and it looks to be in between 0.5 and 1.0! I am really nervous for my tangs this was such a stupid mistake, they are both eating and acting normal I put some carbon back in to hopefully pull out some of the cupramine. Is this fatal? Any suggestions?