If your getting fish that need bigger bodies of water to live then I would suggest a bigger tank for the QT.
Actually, you can get some live rock, just make sure to never put the live rock that's in your QT in your display tank.
For my tank I used a dead shrimp that I bought at a seafood store to cycle. I left the shrimp in for a couple of days. Also you should add bottled bacteria. Seem to have worked for me