Hi there,
you do not need any live rocks for your QT tank. My tank is 2 ft filtered with a powerhead loaded with bio balls.
Use PVC pipes for the fish to hide and do not add sand, just BB. Any Calcareous material in the tank will make the copper medication less effective because Calcareous material absorbs copper.
I also use a protein skimmer to keep dissolved organics and No3 down. Make sure your tank is mature 1st B4 qt'ing any fish. That is all to it, nothing special, no secret and definitely not rocket science!
Last but not least, add cupramine to 0.3 ppm and strictly follow the instructions on the bottle. Cupramine is pygmy angel safe, I used cupramine to qt my bicolor angel and he is in my tank for almost 2 yrs already.
HTH