You can set up the QT with out any seed You just need to be ready with a few water changes because it will cycle. The WC
's will keep things in check. If you use any live rock dont return it to the main system, you could bring any thing back into it.
If it were me i'd just set the QT up and do water changes until things settle. I run a small HOB
in my sump i keep it filled with filter-floss this way i can set up my QT and not have a cycle after im done with QT i replace the floss after cleaning the HOB
then back on the sump it goes until next time.
Most people create their own problems by not following the basics and refusing to stock appropriate to their system. Gregcoyote 2013
SPS = Stability Promotes Success