Outbreak in QT with Blue Tang

[Blaise006]

7 fish have been in qt for the new tank.

At day 15 the blue tang broke out. The rest of the fish are fine and everyone is eating aggressively.

Copper is measure with Hanna. I am using copper power at 2.5 ppm.

The blue tang seems to be the only one impacted.

Does anyone have experience dealing with an outbreak like this after two weeks into the QT period? I assume the qt period resets to 0.

Copper is maintained at 2.5ppm with an ATO.

Pictures of the blue tang and clean powder tang for reference.

 

[Wlachnit]

That's a bummer. Yes, clock restarts. I'm not familiar with that specific copper treatment but maybe that Cu amount wasn't high enough?

 

[Srt4eric]

Are you on humble.fish?

 

[Srt4eric]

That's a really good forum on disease