Adding new fish to existing QT

[Blakjax]

I have a 65 gallon QT tank set up with 3 tangs and a butterfly due to a velvet outbreak in my DT. I’m wondering if I can add new fish to the QT while my DT is fallow. Or would I have to start the timer over for the 4 fish already occupying the QT. I’m using cupermine to treat the fish and I slowly raise the level. So is bad to add fish into the tank with copper at full strength?

 

[Billldg]

You would have to start the timer over I'm afraid. Adding fish to full strength copper is not recommended. I use copper power and add the fish to a 1 ppm level and raise it to 2 ppm. Copper is already toxic, so you do not want to add fish to a higher level of copper. When using cupramine I started at 0 ppm.