Saw this on my firefish as I was about to do my water change and I saw him "darting" across the sand a couple of times. Is this fluke or ich? Can I just treat the tank with prazipro (the only other fish in the tank is a cardinal)? I'm QT a fish in my QT tank right now and currently treating the QT tank with prazipro, is it ok to drop a sick fish into a QT tank with a fish that's almost done with QT? What should I do?