If it wasn't caused by bits and pieces being kicked up by your water change (that should settles within a few hours), the cloudiness could be from a bacteria or algae bloom... I had this pop up once or twice in the first few months of my tanks.
I'd let it wait a day or two and monitor the water quality. The tank usually settles down and balances itself out (I think people "play" with their tanks too much). However, if you're noticing a change in your fishies behavior or in the quality of water, do another water change and monitor from there.
Devin