For your pH, you can point a ph toward the sruface in order to promote surface agitation. That should keep it stable.
What type of covering do you have over the tank? Personally, I don't like to dose my tank with anything.
The QT can be set up rather quickly if you move your seeded material from your main tank, like filter sponges. Keep in mind, the nitrifying bacteria resides in/on your LR
/sand and other equipment (like the aformentioned sponges/media), very little of this bacteria resides in the water column. With enough media, you could have it setup within a day.