After I cycled the QT, I bought 2 golden maroon clownfish on Sunday. On Tuesday, I added copper after my daughter noticed some white on the larger of the 2. Today, when I got home, I noticed the white had spread to both sides, but a piece has flaked off. I added more copper. Hopefully, it isn't velvet. I will watch over both fish for the next couple of days. If it is velvet, how long do they usually last? Could I have caught it in time where I might be able to save it? I will take a pic soon and post it.