Sorry to hear about this. I have had more difficulty with these fish than all others combined. Glad to hear it never hit your display tank, good for you not making that mistake. I agree and disagree with some of the previous info. Adding any meds to a display is just a bad idea. Running the display fallow for 8 weeks will rid white spot 99.8 % of the time. I have done so and it worked for me several times. I agree copper and hypo both work, but after reading, and my own experience, hypo is the less stressful method for the fish. Anyway, I hope you have better luck with the next one.